Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu quan » hieu qua, lieu quan, thien quan
trang cua » tranh cua, tang cua, trung cua
dong cong » duong cong, dung cong, dang cong
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu quan) or (tran quang)) - hanh trang cua dong cong tac ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quan) OR (tran quang)) - hanh trang cua dong cong tac ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quan) or (tran quang)) - hanh trang cua dong cong tac ((toan cau) or (toan tap))*.