Perhaps you should try some spelling variations:
"dung nhan tra slippers" » "dung luan tra slippers", "dung thanh tra slippers", "dung khanh tra slippers", "dung nhan tham slippers", "dung nhan tra slippery", "dung nhan tra 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 nhan tra 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 nhan tra slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nhan tra slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nhan tra slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.