Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong hat trong slippers" » "cong chat trong slippers", "cong nhat trong slippers", "cong vat trong slippers", "cong ha trong slippers", "cong hat trong slippery", "cong hat trong 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 java java snippets") or ("cong hat trong 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 hat trong slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cong hat trong slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cong hat trong slippers"))) or ("locating bug code snippets"))*.