Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung luan ben slippers" » "dung luan ban slippers", "dung luan den slippers", "dung luan len slippers", "dung luan ben slippery", "dung luan ben grippers"
"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 luan ben 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 luan ben slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luan ben slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luan ben slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.