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database keyword search with the option to expand keyword

This project received 13 bids from talented freelancers with an average bid price of $403 USD.

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Employer working
Skills Required
Project Budget
$250 - $750 USD
Total Bids
13
Project Description

general project description:
perform database keyword search based on user provided keywords.
if the search results empty; there need to be an option to expand keyword (find synonyms) by referring to ontology e.g. car - automobile. then perform search based on the new keyword.
the search result must be ranked by using information retrieval style ranking system such as recall/precision.

I could provide more detail information later.

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