Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cuon danh het slippers" » "cuong danh het slippers", "cuoi dan het slippers", "cuon sach het slippers", "cuon danh viet slippers", "cuon danh hieu slippers", "cuon danh bat slippers", "cuon danh het slippery", "cuon danh het 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 het 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 het slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cuon danh het slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cuon danh het slippers"))) or ("locating bug code snippets"))*.