Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"luan hoc tan snippets" » "luan hoan tan snippets", "quang hoc tan snippets", "luan khoa tan snippets", "luan hoc dan snippets", "luan hoc tap snippets", "luan hoc tai snippets", "luan hoc tan 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: (((("luan hoc tan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan hoc tan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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