I live in Malaysia, but my targeted customers possibly and mainly will be from U.S. I sell Digital Products like PHP scritps etc. but the thing is there's like nobody buying them in Malaysia. My recent customers mainly from US. What's the best tweaks for targetting customers which are not from your local country?
Well with Adwords you cxan use geotargetting, you can choose The United States, that would put you on the US market to sell your php scripts.
NemexAff is totally right, use geotargeting to put your products in front of the right target audience for your products. As one little hint, don't use the broad geotargeting for "USA", break it down by states in Adwords, this geotargeting setting is more reliable in delivering you 99% traffic from the US.