Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau tren, cau treo
xuc va » tuc va, luc va, xac va
vi cuu » vi luu, vinh cuu
x hoi » o hoi, x ho, 5 hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang ((x hoi) OR (xa hoi)). hieu van cam ((xuc va) OR (duc va)) thanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ly nang ((x hoi) or (xa hoi)). hieu van cam ((xuc va) OR (duc va)) thanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang ((x hoi) or (xa hoi)). hieu van cam ((xuc va) OR (duc va)) thanh vi cuu tre*.