I haven't found any way to get more rewards, but I can quickly get the daily limit.
I generally do a search for a particular category such as "cast of "Lord of the Rings," "cast of Downton Abbey" or "Chili recipes" "autumn recipes" etc...
Once I do that search a gray stripe comes up with results and photos of that search. So a search for "cast of Harry Potter" would show a gray stripe with Daniel Radcliffe, Emma Watson, Rupert Grint etc... all in a line. Then I just click on each person, working my way across the line left to right. I pause only slightly to let the search load and then I click on the next person (or recipe). Each of those clicks on individual people is a search, but it keeps the gray stripe from the first search up there so you can just move to the next.
This works on both PC and mobile searches.