I have about 27,000 items on my site. When I search for certain items on my site by typing in keywords from the title of the product, some appear in the first 3 pages. other items do not appear at all 10+ pages deep. I am not sure why some products appear in top 3 pages and other products do not show up at all. I see 30,000+ items are indexed on my site according to webmaster tools. So I believe they have my whole site indexed.

Any thoughts?