Search engines provide the main search services

At present, some of the main   search engines provide search services are:  

1) combined with keyword search directory (Browsing  &   Searching  Integration)  

A typical

this type of search tool is Sohu (  

2) (Precise  Search) accurate retrieval  

the accurate search in two ways, one is the use of controlled vocabularies, another is the use of XML technology.  

3) natural language retrieval (Natural  Language  Search)  

4) (Multilingual)   multilingual retrieval;

5) multimedia retrieval (Multimedia  Search)  

6) (Filtered  Search) filter retrieval  <.

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