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 de snippets", "dung dung con snippets", "dung dung chode snippets", "dung dung congde snippets", "dung dung cuade snippets", "dung dung code slippers"
"dung co xac snippets" » "dung cho xac snippets", "dung cong xac snippets", "dung cua xac snippets", "dung co cac snippets", "dung co xac 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 co xac snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung co xac snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung co xac snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung co xac snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.