Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trinh » canh tranh, hanh chinh
viet nang » viet hoang, viet trang, viet nam
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan
he viet » che viet, te viet, le viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: he viet nang - hanh trinh cua thong cong ((dan than) or (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: he viet nang - hanh trinh cua thong cong ((dan than) OR (van than)) cau.
• Adding a wildcard symbol may retrieve word variants: he viet nang - hanh trinh cua thong cong ((dan than) or (van than)) cau*.