Perhaps you should try some spelling variations:
"khoa hoc nhanh snippets" » "khoa hoc nganh snippets", "khoa hoc phan snippets", "hoa hoc nhanh snippets", "khoa hoc nhanh slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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 hoc nhanh snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa hoc nhanh snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("khoa hoc nhanh snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.