Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
theo sach » thuoc sach, te sach, theo lich
trung cua » truong cua, trung tuan, trung cap
tang cua » mang cua, hang cua, tang luan
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 ((theo sach) or (thien hach)) - hanh ((trung cua) or (tang cua)) trong cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (thien hach)) - hanh ((trung cua) OR (tang cua)) trong cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (thien hach)) - hanh ((trung cua) or (tang cua)) trong cong dan than cau*.