Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thong cong » trong cong, tong cong, thong thong
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cua » truong cua, trung tuan, trung cap
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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: hoc thien hach - hanh ((trung cua) OR (tang cua)) thong cong dan ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh ((trung cua) or (tang cua)) thong cong dan ((than cau) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh ((trung cua) or (tang cua)) thong cong dan ((than cau) OR (than cap))*.