Perhaps you should try some spelling variations:
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
hieu tuc » hieu thuc, hieu luc, hieu thuoc
cham duc » pham duc, cham soc, pham duy
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
hien tu » khien tu, dien tu
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
x hoi » xa hoi, o hoi, x ho
de su » den su, ve su, de tu

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 tri nang x hoi. ((hieu tuc) OR (hien tu)) cham duc va danh de su triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach tri nang x hoi. ((hieu tuc) or (hien tu)) cham duc va danh de su triet*.