Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh nang » anh nang, ganh nang, hanh mang
dong cong » duong cong, dung cong, dang cong
cao dong » cao dang, lao dong, cao cong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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)) - hanh nang cao dong cong dan phan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (chieu sang)) - hanh nang cao dong cong dan phan cau*.