Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"cao duc tung snippets" » "cao duc trung snippets", "cao duc hung snippets", "cao duc dung snippets", "dao duc tung snippets", "cao suc tung snippets", "giao duc tung snippets", "cao 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: (((("cao 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: (((("cao duc tung snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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