Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"luan cong che snippets" » "luat cong che snippets", "luong cong che snippets", "luan chung che snippets", "luan cong cho snippets", "luan cong chi snippets", "luan cong chu 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 ("luan cong che snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("luan cong che snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( luan cong che snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("luan cong che snippets"))) or ("locating bug code snippets"))*.