Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"do dung sach snippets" » "do duong sach snippets", "do dung sai snippets", "do dung cac snippets", "do ung sach snippets", "so dung sach snippets", "do dang sach snippets", "do dung sach 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: (((("do dung sach snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("do dung sach snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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