Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"len hoc sach snippets" » "len hoc sinh snippets", "len hoc cac snippets", "len hoc anh snippets", "den hoc sach snippets", "len hoa sach snippets", "benh hoc sach snippets", "len hoc 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: (((("len hoc 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: (((("len hoc sach snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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