Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"sach duc hai snippets" » "sach duoc hai snippets", "sach dung hai snippets", "sach nuoc hai snippets", "sach cuc hai snippets", "sach duc dai snippets", "sach duc hau snippets", "sach duc hai 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: (((("sach duc hai snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sach duc hai snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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