Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trung hai » trung ha, trung dai, trong hai
hai dung » hai duong, mai dung, hai dang
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
khan cap » khan ap, khoan cam, phan cac
than cap » thanh lap, thanh cac, than cua

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 thieu xanh - thanh trung hai dung ((cong ban) OR (cong tan)) ((khan cap) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh trung hai dung ((cong ban) OR (cong tan)) ((khan cap) or (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh trung hai dung ((cong ban) OR (cong tan)) ((khan cap) or (than cap))*.