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They (Google) have a feature built-in to the search engine so that if you put all the terms you want to absolutely see in quotes, for example: "tomato seeds grow", it won't return results without any of those terms.

Note that it will only return results with pages that have those terms in that order.

[ggus]

if you wrap each word in quotes it works the intended way.

eg. "tomato" "seeds" "grow"

[vinw]

Another way to do this is start your search with "allintext:"

    allintext: tomato seeds grow

[markyc]

or +tomato +seeds +grow