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Most of the stock footage websites have limited search implementations. For example, using multiple words generally returns content that matches any word, rather than all words. As such, you may fare better trying different individual, specific terms rather than stringing together many words.
Keep in mind this is a very basic search tool only meant to help you get started — advanced features like quotes and wildcards won't work here. You may want to search on the opened stock footage sites independently as well as some do have better search implementations than others.

Options

A-tier

Great library and no-hassle licensing.

Great library and no-hassle licensing.

Decent free library but excessive checkout system.

Decent free library but seems to be only happy stuff...

Widest variety but varied licensing.

B-tier

Decent library but HD only.

Decent library but HD only.

Annoying; doesn't tell you resolution or frame rate.