Given a collection of terms (clauses) and a query term (clause) , find in some/all terms related to according to a certain retrieval condition.

"What" was a general query term he had learned to use.

You can simply type some query terms into the text dialogue there and press GO (or press Enter).

Suppose a query term appears in documents.

For example, various web applications employ AJAX to automatically complete query terms and suggest popular searches.

Science.gov Alerts will keep up to 6 previous alerts for each specific query term.

Selectional preference based method tries to exploit some association rules between the query terms to help with the query classification.

Their results show that an average query term fails to appear in 30-40% of the documents that are relevant to the user query.

The term frequency ranking function counting the number of times that each query term occurs in the document, then summing these.

Retrieval is based on whether or not the documents contain the query terms.