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