Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
qua cham » qua hai, qua cac, va cham
vanh tai » van tai, hanh tai, anh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
nang o » nang co, nang ho, nang ro
xuc va » tuc va, luc va, xac va
o hoi » co hoi, o hoc, o hai

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: su sach ky nang o hoi. hieu qua cham ((xuc va) OR (duc va)) vanh tai cua triet~.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu qua cham ((xuc va) or (duc va)) vanh tai cua triet*.