AdWords Keyword Tool is currently showing results from last month’s searches, more narrowed period might show more relevant information for advertisers looking for interesting keywords for their campaigns. This might have a negative effect also, if for a reason or another a keyword become popular for a month then next month the results drop down, in this case showing results for one month are not enough to decide. This information you can find if you choose “Search Volume Trends” in the display data options.
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Tips : You can use the Site-Related Keywords to help you generate list of keywords relevant to your website, if you find keywords not relevant copy a relevant article from your website and paste it in the optional textarea. This should work much better.