Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung kem he snippets" » "vung kem he snippets", "dong kem he snippets", "dung ket he snippets", "dung ke he snippets", "dung kem theo snippets", "dung kem hieu 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 kem he snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung kem he snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung kem he snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung kem he snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.