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