Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"phan van vo snippets" » "phan van code snippets", "pham van vo snippets", "thanh van vo snippets", "luan van vo snippets", "phan van von snippets", "phan van vu snippets", "phan van do 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: (((("phan van vo snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan van vo snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
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