Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
vu dang » su dang, vu quang, cua dang
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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 (vu dang)) ma hoi. hieu ve cam xuc va danh vi ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) or (vu dang)) ma hoi. hieu ve cam xuc va danh vi ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (vu dang)) ma hoi. hieu ve cam xuc va danh vi ((cuu tre) OR (cau tren))*.