Perhaps you should try some spelling variations:
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code slippers"
"trinh cua vu snippets" » "tinh cua vu snippets", "trinh luat vu snippets", "trinh quan vu snippets", "trinh cua su snippets", "trinh cua vi snippets", "trinh cua cu snippets", "trinh cua vu slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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