Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
va thanh » gia thanh, ban thanh, va tinh
thanh do » thanh de, thanh pho, thanh hoa
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
tang ma » tang van
duoc va » nuoc va, duc va, duoc ma
va lam » van lam, va lap
do va » do van, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((mang may) or (tang ma)) hoi. lieu va lam duoc va thanh do va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((mang may) OR (tang ma)) hoi. lieu va lam duoc va thanh do va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((mang may) or (tang ma)) hoi. lieu va lam duoc va thanh do va triet*.