Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa van doi snippets" » "hoa van doi snippets", "khoa can doi snippets", "khoa luan doi snippets", "khoa van loi snippets", "khoa van noi snippets", "khoa van do 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: (((("khoa van doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa van doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("khoa van doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.