Perhaps you should try some spelling variations:
"lochating bug code snippets" » "locating bug code snippets", "lochating bug core snippets"
"python using java snippets" » "python using data snippets"
"van toi hoc snippets" » "van tai hoc snippets", "van thi hoc snippets", "van toan hoc snippets", "van hoi hoc snippets", "van toc hoc snippets", "van tri hoc snippets"

Try widening your search to All Fields.

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