Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"cac duc tung snippets" » "cac duc trung snippets", "cac duc hung snippets", "cac duc dung snippets", "cac du tung snippets", "cac dac tung snippets", "cao duc tung snippets", "cac duc tung 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: (((("cac duc tung snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cac duc tung snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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