Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tang van » dang van, hoang van, trong van
hieu van » hieu va, thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
phuc van » thuc van, phuc va, chuc van
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ky ((nang ma) or (tang van)) hoi. hieu van cau phuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang ma) OR (tang van)) hoi. hieu van cau phuc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang ma) or (tang van)) hoi. hieu van cau phuc van hanh di cua tre*.