Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
nang van » dang van, tang van, lang van
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
cau xuc » cam xuc, cau luc, cau truc
van cau » van dau, van hau, van chat
tu sach » thu sach, te sach, tu cach
van hoc » van hoa
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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