Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi de dong snippets" » "khi de dong snippets", "khoa de dong snippets", "khoi he dong snippets", "khoi den dong snippets", "khoi di dong snippets", "khoi de dang 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: (((("khoi de dong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoi de dong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("khoi de dong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.