Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
manh trung » manh tung, thanh trung, manh hung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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: ho ((chieu sang) OR (hieu quang)) - manh trung cua nhung ((cong dan) OR (cong tan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu quang)) - manh trung cua nhung ((cong dan) OR (cong tan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quang)) - manh trung cua nhung ((cong dan) OR (cong tan)) toan cau*.