Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
chiet tach » chieu sach
dong cong » duong cong, dung cong, dang cong
trung co » trong co, truong cao, trung hoc
trung bo » truong bo, trung hoc, trung hoa
cong tac » cong ty
tac nhan » tao nhan, cac nhan, dac nhan
nhan cau » nhanh cau, phan cau, nhan sau

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 xanh) OR (chiet tach)) - thanh ((trung co) OR (trung bo)) dong cong tac nhan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chiet tach)) - thanh ((trung co) OR (trung bo)) dong cong tac nhan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chiet tach)) - thanh ((trung co) OR (trung bo)) dong cong tac nhan cau*.