Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cong cua » cong cu, huong cua, thong cua
dong cua » dung cua, huong cua, thong cua
han cong » phan cong, hang cong, hanh cong
cong tan » cong tac, cong san, cong thanh
toan ban » van ban

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 ((cong cua) OR (dong cua)) han cong tan ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((cong cua) OR (dong cua)) han cong tan ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((cong cua) OR (dong cua)) han cong tan ((toan tap) or (toan ban))*.