Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, truong thanh
bien tinh » bi tinh, diep tinh, ban tinh
trung cap » truong cao, trung tam
dong cong » duong cong, dung cong, dang cong
tran tuan » tran xuan, tran quang, tran thanh
yen tinh » tuyen tinh
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((bien tinh) or (yen tinh)) - thanh ((trung tuan) or (trung cap)) dong cong tan tran tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((bien tinh) OR (yen tinh)) - thanh ((trung tuan) OR (trung cap)) dong cong tan tran tuan.
• Adding a wildcard symbol may retrieve word variants: ho ((bien tinh) or (yen tinh)) - thanh ((trung tuan) or (trung cap)) dong cong tan tran tuan*.