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It's also indicative that your site isn't ranking as well for X,Y or Z than the 20 pages of sites above you!
Sounds like you need to get more inbound links!
Also, may sure that X, Y and Z are in the <title> and <h1> of the page that you want to do well for that search....
Also: optimizing anchor text for your internal links sometimes works wonders. Do not use "Home" for the 'back home' link on all your pages. Use "Home: X Y Z" or something similar.