Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu qua, diep quang
nhung cong » dung cong, thong cong, hang cong
toan thanh » tran thanh, hoan thanh, toan thang
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong toan » cong tan, cong hoan, cong tuan
thanh cau » thanh chau, thanh mau, nhanh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (hieu quan)) - thanh trung cua nhung cong toan thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (hieu quan)) - thanh trung cua nhung cong toan thanh cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (hieu quan)) - thanh trung cua nhung cong toan thanh cau*.