Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
hoa duoc » hoa hoc
duoc ban » duc ban, quoc ban, buoc ban
ban hanh » ban hang
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
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) or (su sach)) ky tang xa hoi. hieu van hoa duoc ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (su sach)) ky tang xa hoi. hieu van hoa duoc ban hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (su sach)) ky tang xa hoi. hieu van hoa duoc ban hanh di cua tre*.