Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
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
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, v nang, may nang
ve cac » va cac, vien cac
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 ((y nang) OR (ly nang)) ma hoi. hieu ve cac du va thanh ((dat cua) OR (mat cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) OR (ly nang)) ma hoi. hieu ve cac du va thanh ((dat cua) or (mat cua)) te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) OR (ly nang)) ma hoi. hieu ve cac du va thanh ((dat cua) or (mat cua)) te*.