Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sang » chieu sach, chieu xanh, hieu lang
thanh hang » thanh hoang, thanh thang, tranh hang
dong cong » duong cong, dung cong, dang cong
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan lap
hang ca » hang va, nang cao, hang tai
ca dong » cao dong, cau dong, cua dong

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) OR (chieu sang)) - thanh hang ca dong cong dan ((phan cau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (chieu sang)) - thanh hang ca dong cong dan ((phan cau) OR (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (chieu sang)) - thanh hang ca dong cong dan ((phan cau) OR (phan tu))*.