Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toc sach cao snippets" » "hoc sach cao snippets", "doc sach cao snippets", "thuoc sach cao snippets", "toc sach dao snippets", "toc sach cap snippets", "toc mach cao snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("toc sach cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc sach cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("toc sach cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.