Perhaps you should try some spelling variations:
trung quan » truong quan, trong quan, trung tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
trung qua » trong qua, trung cua, truong quan
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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 ((hieu manh) OR (hieu lang)) - thanh ((trung qua) OR (trung quan)) dung cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (hieu lang)) - thanh ((trung qua) OR (trung quan)) dung cong tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (hieu lang)) - thanh ((trung qua) OR (trung quan)) dung cong tan toan cau*.