Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
truc ban » thuc ban, truc dan, truc van
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, dai cua
tuc ban » thuc ban, tu ban, tuc dan
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

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 ky tang xa hoi. hieu van cau ((tuc ban) OR (truc ban)) thanh ((tai cua) OR (tri cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky tang xa hoi. hieu van cau ((tuc ban) OR (truc ban)) thanh ((tai cua) or (tri cua)) te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang xa hoi. hieu van cau ((tuc ban) OR (truc ban)) thanh ((tai cua) or (tri cua)) te*.