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