I have only been doing Netflip for a couple of weeks, but you search for different words every day. For example, greeting cards, electronics etc. Over the past week it has been pretty slim rewards though.
What I did when I started the reward program was to do a search on this board for any posts regarding Netflip. Some people will post their words that they get on Netflip here. I wrote all the words down and on hard days I go through my list, adding on to it as I go. Also, I do try and post my words that I find here on a daily basis, but haven't been doing it much this week. The amounts of the searches change during the day, so (for example) I might find a word that paid me .04 but when another person tries it, they may only get .01.
Remember you can only be paid for 10 searches a day.
Hope I helped