IMO, the key is using the most precise terms for what you want and then use the quotation marks to lock-in key phrases.
For example, I wouldn't use "flow-motion picture" as you mention simply because "picture" has to many other possible meanings. Since I'd want to eliminate the possibilities of getting any site covering still photos, drawings, etc.. I'd used "Flow-motion movie" (in the quotes!).
But each search engine has it's own FAQ with lots of tips on how to best tune your serach terms for their site. Use them!