Do not use internet and move to other planet, so the FBI could not find you?
OR destroy your hard disk, put it into shredder or foundry.
Use data scrubber software may help http://www.summitcn.com/hdscrub.html

And i don't know if Malaysia's ISP got implement Data Retention or not. http://en.wikipedia.org/wiki/Telecommunica..._data_retention
And ohh, Google will save your search history by default, https://history.google.com/history/ can be turned of, fortunately.