Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
nhung cong » thong cong, hang cong, nhung don
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tung cua » trung cua, tuong cua, dung cua
khan cap » than cap, khoan cam, phan cac
khan ap » han ap, khan dam

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 tung cua ((nhung cong) OR (dung cong)) tac ((khan cap) OR (khan ap))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung cua ((nhung cong) or (dung cong)) tac ((khan cap) or (khan ap))*.