Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hien tach » thien hach, chiet tach, vien bach
trang van » tran van, trang va, trong van
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
khan cap » khan ap, than cap, khoan cam
phan cau » phan dau, phan cac, phan tu

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 tach - hanh trang van dong ((cong tan) OR (cong tac)) ((khan cap) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tach - hanh trang van dong ((cong tan) OR (cong tac)) ((khan cap) or (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - hanh trang van dong ((cong tan) OR (cong tac)) ((khan cap) or (phan cau))*.