Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thuong tin » thuong tinh, thong tin, phuong tien
hoc thieu » toc thieu, hoc hien
trong tac » trong cac, tuong tac, trong tan
tren thuc » trien thuc, tron thuc, trinh thuc
tung tin » trung tin, dung tin, trung tinh
tren tau » tren may, tren dat, tren thi

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 tin) OR (thuong tin)) dung trong tac ((tren tau) OR (tren thuc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((tung tin) OR (thuong tin)) dung trong tac ((tren tau) or (tren thuc))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((tung tin) OR (thuong tin)) dung trong tac ((tren tau) or (tren thuc))*.