Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van toi cuu snippets" » "van toi code snippets", "van tai cuu snippets", "van thi cuu snippets", "van toan cuu snippets", "van toi uu snippets", "van toi chu snippets", "van troi cua snippets"
"python using java snippets" » "python using data snippets"

Try widening your search to All Fields.

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