Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"khan van tin snippets" » "khanh van tin snippets", "phan van tin snippets", "nhan van tin snippets", "khan van tien snippets", "khan van tan snippets", "khan van thinh snippets", "khan van tin 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: (((("khan van tin snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khan van tin snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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