Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham cuu » cap cuu, chat cua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
su tren » su tien, tu tren, cu tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
cuu va » cuu van, cuu ve
vi su » va su, ve su, ki su

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: thu sach y nang ((ma hoi) OR (ma hoa)). lieu va cham cuu va hanh vi su tren~.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ma hoi) or (ma hoa)). lieu va cham cuu va hanh vi su tren*.