There are several ways to increase your Tech Points.

1) Have lots of villagers researching. At Level 1 Science each villager can earn from 1-15 Tech Points. Obviously, the more people you have, the more Tech Points you earn.

2) Increase your Science Levels. The maximum number of Tech Points a villager can earn is 20 at Level 2 Science and 33 at Level 3 Science. If you don't have anything else vital that needs your attention, such as food, then increasing Science is to your benefit.

3) Watch or listen to notice when your villagers have earned Tech Points. They'll do what people have described as a "kick step" and you'll hear the clinking of bottles again. Once they do that, you can pick them up and have them research again. Note that I wouldn't recommend doing this too much, since villagers can get injured by researching, and the more you have them research, the more likely they'll get injured just from repetition alone!