Perhaps you should try some spelling variations:
chieu quang » hieu quang, thieu quang, hieu quan
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
chu quang » chat quang, vu quang
trung cap » truong cao, trung tam
cap nhung » cam nhung, vap nhung, dap nhung
cong san » cong tac
toan cao » toan tap
toan ban » van ban

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 quang) OR (chu quang)) - thanh trung cap nhung cong san ((toan cao) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu quang) or (chu quang)) - thanh trung cap nhung cong san ((toan cao) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu quang) or (chu quang)) - thanh trung cap nhung cong san ((toan cao) OR (toan ban))*.