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