Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
trung cua » truong cua, trung cap, dung cua
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (thien hach)) - thanh ((trung cua) OR (trung tuan)) nhung cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) OR (thien hach)) - thanh ((trung cua) or (trung tuan)) nhung cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) OR (thien hach)) - thanh ((trung cua) or (trung tuan)) nhung cong dan than cau*.