Searching some specific thing on the net could be compared to searching a pin at sahara desert. That's why we have to use some additionla operator to find a specific information we want. The Google Cheat Sheet I post last month could be a good guide, but some times we still need more examples of how this guide being used.
Well, let's try to search a 3gp file listed in an index page. Bunjamin give this free good tutorial for us. But, offcourse I don't want to teach you about how to find 3gp nude movie. Use this samrt trcik for some thing good!:
Google: -inurl:htm -inurl:html -inurl:asp intitle:"index of" 3gp
Specific Searches for 3gp files:
Google: filetype:3gp inurl:3gp
You can be specific by adding keyword as you want for example to search Paris Hilton :
Google: filetype:3gp inurl:3gp Paris Hilton
Next: try to search sandra dewi photos! :D