Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh lai » hanh lam, hanh tai, thanh lap
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
cau xuc » cam xuc, cau luc, cau truc
van cau » van dau, van hau, van chat
van hoc » van hoa
ky tang » ky nang, ky dang, ky trong
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

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