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