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When you're doing research, think about your assignment. What is your argument? What do you want to write about? These things become your search terms.
If you're writing an essay to persuade your reader that Confederate monuments should be taken down, first you'll need to break down this argument into simple phrases, like Confederate monuments and monuments taken down. You might be able to find some results if you type in the whole sentence, but search engines work best when you break your search down into keywords or phrases.
It's also helpful to brainstorm synonyms or similar words to the important ones in your topic. For example, for Confederate monuments, you could also search Confederate statues or Confederate memorials. For taken down, you could use removed or destroyed. You'll find more relevant results if you try similar words!
If you're having problems thinking of similar words, do some searches and see what words the authors of the results are using!