Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
dat van » dao van, dat va, dam van
ma hoi » mai hoi, xa hoi, me hoi
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) OR (ma hoa)). hieu van cac dat van hanh vi cua vat~".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) OR (ma hoa)). hieu van cac dat van hanh vi cua vat*.