You can't just throw your thesis into a database-they cannot parse whole sentences properly.
If you want to know how heavy social media use might affect young adults' anxiety and self esteem, you need to break that up into main concepts that can then be used as search terms.
Look at your results, what terms are popping up? You might not have phrased it like that, but maybe that is what it is called in the literature.
If there's a thesaurus tool available, use it! PsycINFO's thesaurus tool is invaluable! Also be sure to look at an article's subject terms or author supplied keywords.
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