Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"cong co sach snippets" » "dong co sach snippets", "cong cu sach snippets", "cong so sach snippets", "cong bo sach snippets", "cong cuon sach snippets", "cong hoc sach snippets", "cong co 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: (((("cong co 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: (((("cong co sach snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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