Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
cong ban » cong bang, cong san, cong tan
cong tac » cong ty
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: ho ((hieu lang) OR (chieu sang)) - manh trung cua ban ((cong ban) OR (cong tac)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (chieu sang)) - manh trung cua ban ((cong ban) or (cong tac)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (chieu sang)) - manh trung cua ban ((cong ban) or (cong tac)) phan cau*.