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