I am ranked for weird search keyphrases

My site is one month old , get most of my backlinks from article directories.

My site is ranked highly for these phrases

score check - my anchor is "credit score check"
freeonline credit report - my anchor is "free online credit report"
your3in1 - my anchor is "3 in 1 credit report"
checkcredit -my anchor is "check credit report"

Why do I get referrals from above prhases that are different from my anchor text?

My site doesn't contain keywords freeonline,your3in1 and checkcredit

Confused...

it's called LSI. google deem ur site correlate with those terms. it's not weird.