Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"dan duy dung snippets" » "dan duc dung snippets", "dan duy hung snippets", "dan duy tung snippets", "van duy dung snippets", "dan quy dung snippets", "dao duy dung snippets"

Try widening your search to All Fields.

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