Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"trinh hoc phat slippers" » "trinh hoa phat slippers", "tinh hoc phat slippers", "trinh hoi phat slippers", "trinh hoc phan slippers", "trinh hoc phap slippers", "trinh hoc pho slippers", "trinh hoc phat slippery", "trinh hoc phat grippers"
"locating bug code snippets" » "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 java java snippets") or ("trinh hoc phat slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("trinh hoc phat slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh hoc phat slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh hoc phat slippers"))) or ("locating bug code snippets"))*.