Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
chieu tinh » trieu tinh, lieu tinh, chau tinh
cua nhung » va nhung
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
cua hang » cua dang, cua cong, cua ban
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 sang) OR (chieu tinh)) - thanh trung ((cua hang) OR (cua nhung)) cong manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu tinh)) - thanh trung ((cua hang) OR (cua nhung)) cong manh toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chieu tinh)) - thanh trung ((cua hang) OR (cua nhung)) cong manh toan cau*.