Perhaps you should try some spelling variations:
"thanh lieu da snippets" » "thanh liem da snippets", "thanh thieu da snippets", "thanh vien da snippets", "thanh lieu dao snippets", "thanh lieu dai snippets", "thanh lieu dia snippets"
"dung java java snippets" » "dung va java 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: (((("thanh lieu da snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thanh lieu da snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thanh lieu da snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thanh lieu da snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.