Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"phi hoc sinh snippets" » "phoi hoc sinh snippets", "khi hoc sinh snippets", "pho hoc sinh snippets", "phi hoc dinh snippets", "phi hoc minh snippets", "phi hoc kinh snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("phi hoc sinh snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phi hoc sinh snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
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