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