Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((xa hoi) or (ma hoa)). hieu ve nam thuc va hanh vai ((va triet) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((xa hoi) OR (ma hoa)). hieu ve nam thuc va hanh vai ((va triet) OR (va thieu)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((xa hoi) or (ma hoa)). hieu ve nam thuc va hanh vai ((va triet) or (va thieu))*.