Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ty nang » ky nang, ty hang, ly nang
van cai » van hai, van chi, van ai
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
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 ((ty nang) or (ty xang)) ma hoi. hieu ((van cai) OR (van cau)) dat va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) ma hoi. hieu ((van cai) OR (van cau)) dat va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) or (ty xang)) ma hoi. hieu ((van cai) OR (van cau)) dat va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty xang)) ma hoi. hieu ((van cai) OR (van cau)) dat va hanh vi cua vat*.