Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, kien sach, thien hach
trung cua » truong cua, trung tuan, trung cap
tran tuan » tran xuan, tran quang, tran thanh
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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 sach - thanh ((trung cua) or (tran tuan)) nhung cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - thanh ((trung cua) OR (tran tuan)) nhung cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - thanh ((trung cua) or (tran tuan)) nhung cong tan than cau*.