Summary of student research

These are the expressions everybody found:

I searched "turn into" on google. There were 12,500,000 "turn into"s.
I found"build upon" and I search on google and found over 13,600,000 of them.
I found "build upon knowledge".there were 11,800 on google.(It could also be 'the knowledge' or 'our knowledge' which would make this number higher. So, 'build upon knowledge' is probably a stable expression. Anyway, I feel that it is.)
I found"can also be". 94,600,000 on the web.
I found "seem to", there are 129,000,000 "seem to" on google.
I found"It seems to".There were 34,400,000."It seems to" is on google. ( How about ‘It seems to me that…)
I found "link to". There were 2,660,000,000 "link to" on google.
I found "in terms of " .I looked for that word on google and there were 158,000,000 "in terms of"s .
I found "successful at". There were 3,670,000 "successful at" on google.
I found 'a few'. There are 708,000,000 'a few' on google
I found "add to" There ware about 252,000,000 "add to"s on google.
I found "potato on the couch". There were 324 "potato on the couch"s on google.
It means a person being very lazy.(You mean ‘couch potato’. 324 is not enough. This is a good example of being fixed.)
I found "a hub for". There were 829,000 "a hub for" on google. (Is this a fixed expression, or is ‘for’ just common with ‘hub’?)
It is hard for me to find fixed expressions. And it is also hard for me to learn fixed expression by heart. How can I find fixed expressions easily? Are there any good methods? (Using them correctly is the most difficult thing for a NNS (non-native speaker). However, noticing them is the first step. Next you have to discover the limits (like 'couch potato' above.) They are EVERYWHERE!)
I found "opportunity for" there were 103,000,000
I found "have a voice".There are 1,600,000 sites with the phrase.
I found "drag on".there were 2,180,000 "drag on"s on google.