Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"phan van hau snippets" » "pham van hau snippets", "thanh van hau snippets", "luan van hau snippets", "phan van ha snippets", "phan van hai snippets", "phan van dau snippets", "phan van hau slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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