Perhaps you should try some spelling variations:
"trinh cuu duoc snippets" » "trinh cau duoc snippets", "trinh cua duoc snippets", "trinh chu duoc snippets", "trinh cuu dac snippets", "trinh che duoc snippets", "trinh co duoc snippets", "trinh cuu duoc slippers"
"dung hung code snippets" » "dung chung code snippets", "dung nhung code snippets", "dung huong code snippets", "dung hung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("trinh cuu duoc snippets") or ("dung hung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cuu duoc snippets") OR ("dung hung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cuu duoc snippets ) or ( dung hung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cuu duoc snippets") or ("dung hung code snippets"))) or ("locating bug code snippets"))*.