Perhaps you should try some spelling variations:
thanh trinh » hanh trinh, thanh tinh, thanh binh
thieu xanh » chieu xanh, hieu manh, thien anh
luong cong » dung cong, cong cong, tong cong
hieu lang » chieu sang, hieu quang, nhieu tang
trinh han » trinh quan
dan toan » van toan, dan than, manh toan
toan tap » toan 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) OR (hieu lang)) - thanh trinh han ((luong cong) OR (trong cong)) dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu lang)) - thanh trinh han ((luong cong) OR (trong cong)) dan toan tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu lang)) - thanh trinh han ((luong cong) OR (trong cong)) dan toan tap*.