Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"nham han tap snippets" » "nham hoan tap snippets", "nham san tap snippets", "nham van tap snippets", "nham han tai snippets", "nham toan tap snippets", "nham nhan tai snippets", "nham han tap 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: (((("nham han tap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nham han tap snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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