Perhaps you should try some spelling variations:
"dung tri thuoc snippets" » "dung tri thuc snippets", "dung tri hoc snippets", "dung tin thuoc snippets", "dung tai thuoc snippets", "dung tren thuoc snippets", "nhung tri thuoc snippets", "dung tri thuoc 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 tri thuoc 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 tri thuoc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tri thuoc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tri thuoc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.