Search based on taxonomy category. 

This method can be accessed through the SearchManager.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Search/SearchManager.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "Search for categories", Description = "")]
public String[] SearchForCategories(SearchRequestData searchReqData, int index, int count, ref int resultCount);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "Search for categories", Description = "")>
Public Function SearchForCategories(searchReqData As SearchRequestData, index As Integer, count As Integer, ByRef resultCount As Integer) As String()