Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
van tai » von tai, van tuan
tai cau » tai cac, tai cao
va cam » va cham, va cao, va cai
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) or (o hoi)). hieu ((va cam) or (va cac)) tuc va van tai cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (o hoi)). hieu ((va cam) OR (va cac)) tuc va van tai cau trieu.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) or (o hoi)). hieu ((va cam) or (va cac)) tuc va van tai cau trieu*.