Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
te sach » toc sach
mai hoi » dai hoi, lai hoi, mai doi
y nang » ky nang, ly nang, v nang
san va » san van, ban va, dan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((mai hoi) or (mai khoi)). hieu van pham duc va thanh san va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((mai hoi) OR (mai khoi)). hieu van pham duc va thanh san va triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((mai hoi) or (mai khoi)). hieu van pham duc va thanh san va triet*.