Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tang » van thang, van trang, van nang
nuoc van » nuoc va, nuoc san, luoc van
tang di » hang di, tang du, tang da
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
cua te » cua tu
ve dat » de dat, va dat, ve dao

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: ((te sach) OR (toc sach)) y nang ma hoi. hieu ve dat nuoc van tang di ((cua te) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang ma hoi. hieu ve dat nuoc van tang di ((cua te) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang ma hoi. hieu ve dat nuoc van tang di ((cua te) or (cuu tre))*.