Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"khi hoc data snippets" » "khi hoc dat snippets", "khi hoc dan snippets", "khi hoc dai snippets", "khi hoi data snippets", "khien hoc data snippets", "khoa hoc data snippets"

Try widening your search to All Fields.

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