Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cuon danh dung slippers" » "cuong danh dung slippers", "cuoi dan dung slippers", "cuon sach dung slippers", "cuon dan dung slippers", "cuon anh dung slippers", "cuon dinh dung slippers", "cuon danh dung slippery", "cuon danh dung 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 ("cuon danh dung slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("cuon danh dung slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cuon danh dung slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cuon danh dung slippers"))) or ("locating bug code snippets"))*.