Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thanh va » thanh van, hanh va, thanh ha
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
duc ban » duc tan, duc van, dua ban
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((ma hoa) or (xa hoi)). hieu van pham duc ban thanh va ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((ma hoa) OR (xa hoi)). hieu van pham duc ban thanh va ((va triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((ma hoa) or (xa hoi)). hieu van pham duc ban thanh va ((va triet) or (cua viet))*.