Perhaps you should try some spelling variations:
"khoa viet dat snippets" » "khoan viet dat snippets", "hoa viet dat snippets", "thoai viet dat snippets", "khoa viec dat snippets", "khoa viet da snippets", "khoa viet dao snippets", "khoa viet dat slippers"
"python using sat snippets" » "python using data snippets", "python using a snippets", "python using raw snippets", "python using sat 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("khoa viet dat snippets") or ("python using sat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa viet dat snippets") OR ("python using sat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa viet dat snippets ) or ( python using sat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa viet dat snippets") or ("python using sat snippets"))) or ("locating bug code snippets"))*.