Perhaps you should try some spelling variations:
"python using code snippets" » "python using cfd snippets", "python using one snippets", "python using code slippers"
"khoa can phi snippets" » "khoa cam phi snippets", "khoa cap phi snippets", "khoi can phi snippets", "khoa can thi snippets", "khoa can chi snippets", "khoa chau phi snippets", "khoa can phi slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("khoa can phi snippets") or ("python using code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa can phi snippets") OR ("python using code snippets"))) OR ("locating bug code snippets")).
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