Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"trinh cac thoi slippers" » "trinh cau thoi slippers", "trinh chat thoi slippers", "trinh chao thoi slippers", "trinh cac toi slippers", "trinh cac hop slippers", "trinh cac tro slippers", "trinh cac thoi slippery", "trinh cac thoi 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 cac thoi 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 cac thoi slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh cac thoi slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh cac thoi slippers"))) or ("locating bug code snippets"))*.