Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
cua nhung » va nhung
tung cua » trung cua, tuong cua, dung cua
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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 tinh) OR (chieu sang)) - thanh tung cua nhung ((cong san) OR (cong tac)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (chieu sang)) - thanh tung cua nhung ((cong san) OR (cong tac)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (chieu sang)) - thanh tung cua nhung ((cong san) OR (cong tac)) toan cau*.