Perhaps you should try some spelling variations:
"dung cop trong slippers" » "dung co trong slippers", "dung cong trong slippers", "dung choi trong slippers", "dung con trong slippers", "dung coc trong slippers", "dung cop trong slippery", "dung cop trong 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 cop trong 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 cop trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cop trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cop trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.