Perhaps you should try some spelling variations:
mai khoa » tai khoa, may khoa, dai khoa
va thanh » gia thanh, ban thanh, va tinh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
te sach » toc sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
san va » san van, ban va, han va
dan va » doan va, dan ca, ban 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 v nang ((mai hoi) or (mai khoa)). hieu va pham duc va thanh ((san va) OR (dan va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((mai hoi) OR (mai khoa)). hieu va pham duc va thanh ((san va) OR (dan va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((mai hoi) or (mai khoa)). hieu va pham duc va thanh ((san va) OR (dan va)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((mai hoi) or (mai khoa)). hieu va pham duc va thanh ((san va) OR (dan va)) triet*.