Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien anh » thien danh, tien anh, thien chanh
trinh hoa » trinh do
trinh han » trinh quan
ung cong » dung cong, luong cong, duong cong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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 anh) OR (thien thanh)) - hanh ((trinh hoa) or (trinh han)) ung cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (thien thanh)) - hanh ((trinh hoa) OR (trinh han)) ung cong tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) OR (thien thanh)) - hanh ((trinh hoa) or (trinh han)) ung cong tan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) OR (thien thanh)) - hanh ((trinh hoa) or (trinh han)) ung cong tan than cau*.