Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, tien anh, thien chanh
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (thien anh)) - thanh tung va nhung cong tan ((than cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (thien anh)) - thanh tung va nhung cong tan ((than cau) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (thien anh)) - thanh tung va nhung cong tan ((than cau) or (khan cap))*.