Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
cam truc » cau truc, nam truc, lam truoc
truc may » tren may, truc va
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
tay hoi » tao hoi, tay thai
tinh ve » trinh ve, tinh ven, dinh ve
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
tay ho » tay co, tay o, tay khao
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky dang ((tay hoi) or (tay ho)). hieu ve cam truc may tinh ve ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang ((tay hoi) OR (tay ho)). hieu ve cam truc may tinh ve ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang ((tay hoi) or (tay ho)). hieu ve cam truc may tinh ve ((cua triet) or (su triet))*.