Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
cong hach » cong sach, cong thanh, cong khanh
dung cua » dung luan, dung cho
toan cau » toan cao, toan ban, toan tai
toan tap » toan 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: hoc hien xanh - hanh ((dung cua) OR (trung tuan)) nhung cong hach ((toan cau) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((dung cua) or (trung tuan)) nhung cong hach ((toan cau) or (toan tap))*.