Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"using den tran slippers" » "using deep tran slippers", "using open tran slippers", "using den tuan slippers", "using den thanh slippers", "using dang tran slippers", "using den tran slippery", "using den tran grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

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