Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
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.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((ma hoi) OR (ma hoa)). hieu van cac xuc ((va hanh) or (gia thanh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((ma hoi) OR (ma hoa)). hieu van cac xuc ((va hanh) OR (gia thanh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((ma hoi) OR (ma hoa)). hieu van cac xuc ((va hanh) or (gia thanh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((ma hoi) OR (ma hoa)). hieu van cac xuc ((va hanh) or (gia thanh)) vi cua vat*.