Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu nang » tru nang, tu nong, tu nano
sach tu » sach thu, cach tu, sach ty
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi
cua tu » cua tuc, cua su, cua cu

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: thuoc sach tu nang ((ma hoi) OR (ma hoa)). hieu va cac vuc van hanh lai ((cua tu) OR (cua triet))~.
• Adding a wildcard symbol may retrieve word variants: thuoc sach tu nang ((ma hoi) or (ma hoa)). hieu va cac vuc van hanh lai ((cua tu) or (cua triet))*.