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