Perhaps you should try some spelling variations:
tranh tuan » tran tuan, tranh luan, thanh tuan
cong thanh » dong thanh, cong trinh, cong tan
hien hach » thien hach, hien hanh, hien nhanh
tuan tong » toan tong, thuan trong, toan thong
tong cong » trong cong, cong cong, dung cong
tran cau » tran chau, toan cau, ran cau
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hach - canh tranh tuan tong cong thanh ((tran cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hach - canh tranh tuan tong cong thanh ((tran cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien hach - canh tranh tuan tong cong thanh ((tran cau) or (toan ban))*.