For certain search indexes, you can request a minimum percentage:
http://docs.amazonwebservices.com/AWSECommerceService/2011-08-01/DG/USSearchIndexParamForItemsearch.html
For example, if I am looking for toys, I can get a minimum percentage of the following parameters:
{"SearchIndex": "Toys", "Service": "AWSECommerceService", "AWSAccessKeyId": "xxx", "Timestamp": "2011-12-26T05: 41: 20Z", "Version": "2009 -11- 02 "," Keywords ":" Halo "," AssociateTag ":" xxx "," MinPercentageOff ": 30," Operation ":" ItemSearch "," ResponseGroup ":" Large "}
However, if I am looking for video games, the MinPercentageOff parameter is ignored. The documentation page included above shows which of the search indexes accepts this parameter - note that if the index does not support it, it is simply ignored (the search is not interrupted, it simply does not comply with this parameter).
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