Perhaps you should try some spelling variations:
"trung hieu cua snippets" » "thuong hieu cua snippets", "trung kien cua snippets", "trong hiep cua snippets", "trung hieu qua snippets", "trung dieu cua snippets", "trung bieu cua 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 cua 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 cua snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung hieu cua snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung hieu cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.