Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hoai dan slippers" » "van thoai dan slippers", "van hoa dan slippers", "van hai dan slippers", "van hoi dan slippers", "van hoai dan slippery", "van hoai dan grippers"
"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: (((("van hoai dan slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van hoai dan slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("van hoai dan slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.