Keyphrases
- information retrieval systems
- information retrieval
- query expansion
- document collections
- document indexing
- inverted file
- retrieval effectiveness
- retrieval systems
- user queries
- retrieval model
- user modelling
- relevance feedback
- structured documents
- documents retrieved
- text retrieval systems
- retrieval engine
- relevant documents
- retrieved documents
- database
- probabilistic model
- recommender systems
- data sets