Perhaps you should try some spelling variations:
"trung hieu cach snippets" » "thuong hieu cach snippets", "trung kien cach snippets", "trong hiep cach snippets", "trung hieu cac snippets", "trung chieu sach snippets", "trung hieu ca 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: (((("trung hieu cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trung hieu cach snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung hieu cach snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung hieu cach snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.