Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hien hanh » dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
trang cua » tranh cua, tang cua, trung cua
cua hang » cua dang, cua nhung, cua cong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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 hanh) or (hieu lang)) - hanh trang cua hang ((cong san) or (huong dan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (hieu lang)) - hanh trang cua hang ((cong san) OR (huong dan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (hieu lang)) - hanh trang cua hang ((cong san) or (huong dan)) toan cau*.