Perhaps you should try some spelling variations:
"xung phap luan snippets" » "dung phan luan snippets", "hung pham luan snippets", "xung phi luan snippets", "xung phap luat snippets", "xung phap hoan snippets", "xung phap luan slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("xung phap luan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("xung phap luan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xung phap luan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xung phap luan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.