Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
sang tao » hang tai
chau tre » chau tho, cho tre, cau tra
tu sach » thu sach, su sach, te sach
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
y sang » _ sang, duy sang

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: tu sach y sang tao boi. hieu su cham soc ((va hanh) OR (va danh)) lai ((chau tre) OR (chay tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang tao boi. hieu su cham soc ((va hanh) or (va danh)) lai ((chau tre) OR (chay tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y sang tao boi. hieu su cham soc ((va hanh) or (va danh)) lai ((chau tre) OR (chay tren))*.