Perhaps you should try some spelling variations:
"dung phap quan snippets" » "dung phan quan snippets", "dung phat quan snippets", "dung nhan quan snippets", "dung phap luan snippets", "dung pham quang snippets", "dung phap luat snippets", "dung phap 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: (((("dung phap 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: (((("dung phap quan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung phap quan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung phap quan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.