Perhaps you should try some spelling variations:
mai khoa » tai khoa, may khoa, dai khoa
tinh san » trinh san, tinh sang, tinh son
va triet » va thiet, va trien, ve triet
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va tinh » may tinh
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 khoa)). hieu va pham duc va tinh san va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((mai hoi) OR (mai khoa)). hieu va pham duc va tinh san va triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((mai hoi) or (mai khoa)). hieu va pham duc va tinh san va triet*.