Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien tach » thien hach, chiet tach, vien bach
van phung » van phong, van hung, van chuong
va phung » va phuong, va nhung, va phong
cong ban » cong bang, cong san, cong tan
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien tach - thanh trung ((va phung) or (van phung)) cong ban khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - thanh trung ((va phung) OR (van phung)) cong ban khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - thanh trung ((va phung) or (van phung)) cong ban khan cap*.