Perhaps you should try some spelling variations:
"dan dung nen snippets" » "van dung nen snippets", "tin dung nen snippets", "ap dung nen snippets", "dan dung nhan snippets", "dan dung ngan snippets", "dan dung tren snippets", "dan dung nen slippers"
"dung va java snippets" » "dung java java snippets", "dung va 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 va java snippets") or ("dan dung nen snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung va java snippets") OR ("dan dung nen snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung va java snippets ) or ( dan dung nen snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung va java snippets") or ("dan dung nen snippets"))) or ("locating bug code snippets"))*.