Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
dang cong » dung cong
hieu cac » hieu luc, hieu va, hieu van
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (hieu cac)) - thanh ((tung cua) or (dung cua)) dang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (hieu cac)) - thanh ((tung cua) OR (dung cua)) dang cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (hieu cac)) - thanh ((tung cua) or (dung cua)) dang cong dan than cau*.