There are a few tips to keep in mind while playing Match 3... but there is no like "trick" to getting a high score.
1. Horizontal matches are better than vertical matches (increased likelihood of forming a combo)
2. The lower the match is on the board, the better
3. Since there is a short animation during each match, use that time to find another match
4. You can make a match before the previous match is "complete"
5. Use a mouse :P