Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
doi chieu » doc hieu, doi chi, ho chieu
tong cong » trong cong, cong cong, dung cong
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (doi chieu)) tach - hanh trang va tong cong tan ((than cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (doi chieu)) tach - hanh trang va tong cong tan ((than cau) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (doi chieu)) tach - hanh trang va tong cong tan ((than cau) or (khan cap))*.