Perhaps you should try some spelling variations:
"tong quan can snippets" » "thong quan can snippets", "tong luan can snippets", "luong quan can snippets", "tong quan cau snippets", "tong quan van snippets", "tong xuan can 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: (((("tong quan can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tong quan can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tong quan can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tong quan can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.