Search engine is not only for searching right things and its rewarding too.
Earning money is always fun, here are possible ways to earn money while using search engine
Microsoft Bing - Join bing its free and earn rewards and shop in your favourite online store with redeem ponits.
Swag Search - Join Swag Bucks and set your default search engine to swag search. Random search text will be rewards and you can redeem as gift card instantly. Read more here
Inbox Dollars - Join Inbox dollar and earn dollar(s) instantly for every qualified search. You will earn $0.01 for each qualified searches, maximum $0.15 per day.Gold Members will receive $0.10 for the search loyalty reward.