Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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 ty sang ma hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (luc va)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ty sang ma hoi. ((hieu ve) or (hieu va)) cam ((xuc va) or (luc va)) hanh vi cua tre*.