My situation

I've created a search function and for this I created a new indexer and searcher for that. The problem is when I enter a search query with a white space in it. Example below.

Data

I've got this persons created and stands inside my index:

+---------------+------------+-------------+
| Person number | First name | Last name   |
+---------------+------------+-------------+
| 1             | Ilse       | Van de Burg |
| 2             | Devolder   | Marlijn     |
+---------------+------------+-------------+

Search results

I've tried next queries:

+--------------+------------------+----------------+------------------+
| Query number | Term             | Actual result* | Accepted result* |
+--------------+------------------+----------------+------------------+
| 1            | van              | 1              | 1                |
| 2            | van de           | 1              | 1                |
| 3            | ilse             | 1              | 1                |
| 4            | van de burg      |                | 1                |
| 5            | van de burg ilse |                | 1                |
| 6            | de               | 1 & 2          | 1 & 2            |
| 7            | devolder         | 2              | 2                |
| 8            | devolder marlijn |                | 2                |
| 9            | marijn devolder  |                | 2                |
+--------------+------------------+----------------+------------------+
* number of the person. if empty: nothing found or accepted

Question

Some queries are not what I accepted. How could I solve this?

My code

Here is my code I've made:

BaseSearchProvider searcher = ExamineManager.Instance.SearchProviderCollection["PersonSearcher"];
ISearchCriteria searchCriteria = searcher.CreateSearchCriteria(BooleanOperation.Or);
ISearchCriteria query = searchCriteria.Field("lastname", term.MultipleCharacterWildcard()).Or()
                                      .Field("firstname", term.MultipleCharacterWildcard()).Or()
                                      .OrderBy("lastname", "firstname").Compile();
return searcher.Search(query);

Configurations ^update

Examine index

<IndexSet SetName="Artsen" IndexPath="~/App_Data/TEMP/ExamineIndexes/Artsen/">

  <IndexAttributeFields>
    <add Name="id" Type="int" />
    <add Name="nodeName" />
    <add Name="nodeTypeAlias" />
  </IndexAttributeFields>
  <IndexUserFields>
    <add Name="email" />
    <add Name="fax" />
    <add Name="naam" EnableSorting="true" />
    <add Name="onderzoeken" Type="int[]" />
    <add Name="specialismen" Type="int[]" />
    <add Name="subspecialismen" Type="int[]" />
    <add Name="telefoon" />
    <add Name="titel" EnableSorting="true" />
    <add Name="voornaam" EnableSorting="true" />
    <add Name="website" />
  </IndexUserFields>
  <IncludeNodeTypes>
    <add Name="arts" />
  </IncludeNodeTypes>
</IndexSet>

Examine settings (examine index provider):

<add name="ArtsenIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine" supportUnpublished="false"
     supportProtected="true" indexSet="Artsen"
     analyzer="Lucene.Net.Analysis.Standard.StandardAnalyzer, Lucene.Net"/>

Examine settings (examine search provider):

<add name="ArtsenSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine" supportUnpublished="false"
     supportProtected="false" indexSet="Artsen" enableLeadingWildcard="true"
     analyzer="Lucene.Net.Analysis.Standard.StandardAnalyzer, Lucene.Net"/>

Tried also

I've also tried this and got the best results:

query = searchCriteria.GroupedOr(new List<string>() { "naam" }, term.MultipleCharacterWildcard(), term.Escape()).Or()
                      .GroupedOr(new List<string>() { "voornaam" }, term.MultipleCharacterWildcard(), term.Escape()).Or()
                      .GroupedOr(new List<string>() { "titel" }, term.MultipleCharacterWildcard(), term.Escape()).Or()
                      .OrderBy("naam", "voornaam").Compile();

The problem here is when I get two persons with the same last name. For example:

+---------------+------------+-----------+
| Person number | First name | Last name |
+---------------+------------+-----------+
| 3             | Marc       | De Vadder |
| 4             | Freddy     | De vadder |
+---------------+------------+-----------+

Search results:

+--------------+------------------+----------------+------------------+
| Query number | Term             | Actual result* | Accepted result* |
+--------------+------------------+----------------+------------------+
| 10           | de vadder        | 3 & 4          | 3 & 4            |
| 11           | de vadder freddy | 3 & 4          | 4                |
| 11           | de vadder marc   | 3 & 4          | 3                |
+--------------+------------------+----------------+------------------+
* number of the person. if empty: nothing found or accepted