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