1. take into account the relevance of found documents, assigning different
weight to additional words. take few least-matching documents, using their
words with a negative weight
2. from "improving automatic query expansion" - take into accound word
correlations (that is f(idf(w1),idf(w2),idf(w1,w2))), rerank with taking window
into accound and
fuzzy boolean query.
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