Perhaps you should try some spelling variations:
"dung than duc slippers" » "dung thang duc slippers", "dung thanh duc slippers", "dung nhan duc slippers", "dung tran duc slippers", "dung phan duc slippers", "dung than doc slippers", "dung than duc slippery", "dung than duc grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung than duc slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung than duc slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung than duc slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung than duc slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.