Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
hau duc » huu duc, ha duc, pham duc
van hau » van ha, van hai, van dau
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, xa hoi, me hoi
v nang » va nang, vu nang, van nang
de cua » le cua, te cua, dieu 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 v nang ((ma hoi) OR (ma hoa)). hieu van hau duc ((van hanh) OR (van thanh)) de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang ((ma hoi) or (ma hoa)). hieu van hau duc ((van hanh) OR (van thanh)) de cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((ma hoi) or (ma hoa)). hieu van hau duc ((van hanh) OR (van thanh)) de cua tre*.