Perhaps you should try some spelling variations:
"dung tren lan slippers" » "dung trong lan slippers", "dung trung lan slippers", "dung tren lanh slippers", "dung tren lam slippers", "dung tren san slippers", "dung tren lan slippery", "dung tren lan 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 tren lan 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 tren lan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tren lan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tren lan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.