Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tang cac » bang cac, hang cac, tang ca
cac khoi » cac thoi, cac khoan, cach thoi
xuc van » duc van, luc van, vuc van
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (te sach)) ky tang cac khoi. hieu va cac xuc van hanh tai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky tang cac khoi. hieu va cac xuc van hanh tai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky tang cac khoi. hieu va cac xuc van hanh tai ((cua tre) or (cua te))*.