I was reading an article on MSDN where I found a mention to google-fu. It says, “To search for C++ delimeters and code snippets is going to take a little Google-fu on the reader's part.” what does google-fu mean?
Google-fu is defined as "skill in using search engines (especially Google) to quickly find useful information on the Internet."
It is a somewhat tongue-in-cheek reference to kung-fu, which is generally perceived as requiring a high degree of skill to master in the western hemisphere.
In the example sentence you provided, the author is suggesting that the expected results are somewhat difficult to attain and you will need to use diligence when searching.
I used a bit of Google-fu to research this answer.
Google fu is a slightly jokey term referring to the ability to utilise google's search functionality better than your average user.