Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den diep toi snippets" » "den diem toi snippets", "den dien toi snippets", "dien dien toi snippets", "den tiep thi snippets", "den dinh toi snippets", "den dem toi 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: (((("den diep toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den diep toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("den diep toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.