Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh dai » hanh tai, hanh dao, vanh dai
cau phuc » cau truc, chau phu, huu phuc
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
phuc va » phuc vu, thuc va, chuc va
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
va nang » van nang, da nang, kha nang
v nang » vu nang, van nang, voi nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((v nang) or (((va nang) OR (cam nang)))) ma hoi. hieu van cau phuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (((va nang) OR (cam nang)))) ma hoi. hieu van cau phuc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((v nang) or (((va nang) OR (cam nang)))) ma hoi. hieu van cau phuc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) or (((va nang) OR (cam nang)))) ma hoi. hieu van cau phuc va hanh dai cua tre*.