Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
va triet » va thiet, va trien, ve triet
van hoi » van hoc, van hoe, van loi
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky

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: tu dan ky nang ((van hoi) OR (van hoa)). hieu van cam thuc va hanh di ((va triet) OR (cua vat))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ky nang ((van hoi) OR (van hoa)). hieu van cam thuc va hanh di ((va triet) or (cua vat))~".
• Adding a wildcard symbol may retrieve word variants: tu dan ky nang ((van hoi) OR (van hoa)). hieu van cam thuc va hanh di ((va triet) or (cua vat))*.