Ranking Variation With Same Keywords. How To Search Quickly?

Q: Isn't this weird? On the keyword search pr training courses my site is ranked about 2 out of 10 million pages, but on keyword search pr training the site ranks only about 20th out of 29 million. Within the site, URLs etc., the frequency and prominence of the phrase pr training is the same as that of the phrase pr training courses. So why the difference in ranking??? Shouldn't the ranking be identical? I'd very appreciate any explanation that anyone can offer.

A: not wierd. frequency and prominence of phrase are minor ranking factors.