Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
mat cua » ma cua, manh cua, mang cua
dat cua » dai cua, day cua, dan cua
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
du va » dau va, tu va, su va

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) OR (hoc sach)) y nang ma hoi. hieu ve cac du va thanh ((dat cua) OR (mat cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) y nang ma hoi. hieu ve cac du va thanh ((dat cua) OR (mat cua)) tu~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) y nang ma hoi. hieu ve cac du va thanh ((dat cua) OR (mat cua)) tu*.