Keyphrases
- web search
- ad hoc retrieval
- federated search
- information retrieval
- search engine
- web search engines
- question answering
- test collection
- web pages
- retrieval effectiveness
- web information retrieval
- pseudo relevance feedback
- search result
- search queries
- query expansion
- clef ip
- query logs
- relevance feedback
- digital libraries
- document collections
- web queries
- information access
- link structure
- information retrieval systems
- web searching
- natural language processing
- ir evaluation
- personalized web search
- blog opinion retrieval