Perhaps you should try some spelling variations:
trung tuan » trung thanh, tran tuan, truong thanh
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, biet cach
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu cach) or (hieu ca)) - thanh ((trung tuan) or (trung tam)) nhung cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu cach) OR (hieu ca)) - thanh ((trung tuan) OR (trung tam)) nhung cong tan phan cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cach) or (hieu ca)) - thanh ((trung tuan) or (trung tam)) nhung cong tan phan cau*.