Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
lam xuc » cam xuc, lam duoc
van lam » van nam
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
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: toc sach ((ky tang) or (ky dang)) ha hoi. hieu van lam xuc va ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky tang) OR (ky dang)) ha hoi. hieu van lam xuc va ((hanh vai) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky tang) or (ky dang)) ha hoi. hieu van lam xuc va ((hanh vai) or (hanh va)) cua tre*.