Perhaps you should try some spelling variations:
"dung tran quoc snippets" » "dung tren quoc snippets", "hung tran quoc snippets", "dang tran quoc snippets", "dung trung quoc snippets", "dung han quoc snippets", "dung tran duc snippets", "dung tran quoc slippers"
"dung java java snippets" » "dung va java snippets", "dung java java 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: (((("dung tran quoc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tran quoc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tran quoc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tran quoc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.