Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
trang qua » trong quan, trang tuan, trung quan
trong qua » trong quan, thong qua, trong nha
dung cong » dung trong
cong tac » cong ty
khan cap » khan ap, than cap, khoan cam
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 chieu xanh - hanh ((trang qua) OR (trong qua)) dung cong tac ((khan cap) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - hanh ((trang qua) OR (trong qua)) dung cong tac ((khan cap) or (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh ((trang qua) OR (trong qua)) dung cong tac ((khan cap) or (phan cau))*.