If you want to ignore certain words in your search you can use the - operator to ignore these words in your search results.
eg. fish -food
This search will only return results that contain the word fish. Any results that also contain the word food will not be returned.
eg. fish food -goldfish
This search will return search results that contain the words fish and food, but will not return results that also contain the word goldfish.
If you want results that contain words in consecutive order you can enclose your search words with double quotes.
eg. "fish food"
This search will only return results that contain the word fish and the word food in that order that are next to each other. If there is another word inbetween these words, eg. fish flake food, then these results will not be returned.
eg. "fish food" flake
This search will return results that contain the words fish food in consecutive order, but the word flake can be on either side of the words fish food.