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

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