Use keywords that describes the image that you are looking for.
Using more than one keyword, you must put a comma and one space between each one.

E.g. cattle, angus
E.g. flower, native
E.g. cattle, hoof, trimming
E.g. agriculture, soybean, harvester
E.g. cattle, simmental, bull, roundup, cowboy
Using genere and specie: E.g. Casmerodius albus
Using places : E.g. Toronto, Canada

If you don't find what you are searching, use a synonym.