Perhaps you should try some spelling variations:
trung thuat » thuong thuat, trung tuan, trung thuc
trong thuat » trong hoat, trong thu, trong phat
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cong manh » cong danh, duong manh, cong thanh
toan ban » van ban
toan cao » toan tap

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 chiet tach - thanh ((trung thuat) OR (trong thuat)) nhung cong manh ((toan ban) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - thanh ((trung thuat) OR (trong thuat)) nhung cong manh ((toan ban) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh ((trung thuat) OR (trong thuat)) nhung cong manh ((toan ban) or (toan cao))*.