Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"trinh doi dam slippers" » "trinh do dam slippers", "trinh hoi dam slippers", "tinh doi dam slippers", "trinh doi nam slippers", "trinh doi dau slippers", "trinh doi dan slippers", "trinh doi dam slippery", "trinh doi dam 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 doi dam 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 doi dam slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh doi dam slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh doi dam slippers"))) or ("locating bug code snippets"))*.