Perhaps you should try some spelling variations:
"cong trong lan slippers" » "cong thuong lan slippers", "cong trinh lan slippers", "dung trong lan slippers", "cong trong san slippers", "cong trong lam slippers", "cong trong tan slippers", "cong trong lan slippery", "cong trong 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 java java snippets") or ("cong trong lan slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("cong trong lan slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cong trong lan slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cong trong lan slippers"))) or ("locating bug code snippets"))*.