Perhaps you should try some spelling variations:
"dung quoc thinh snippets" » "dang quoc thinh snippets", "dong quoc thinh snippets", "trung quoc thinh snippets", "dung quoc trinh snippets", "dung quoc thanh snippets", "dung quoc tinh snippets", "dung quoc thinh slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code 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 quoc thinh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung quoc thinh snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung quoc thinh snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung quoc thinh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.