Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
nang mai » nang ma, nang tai, lang mai
ca truc » cau truc, ca tru, ba truc
va hanh » van hanh, va danh, ban hanh
so sach » so sanh, co sach, hoc sach
mai hoi » mai khoi, dai hoi, lai hoi
bo sach » co sach, hoc sach
y nang » ky nang, ly nang, v nang
qua ca » qua cac, qua cua, qua cai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y nang mai hoi. hieu qua ca truc ((va hanh) OR (va thanh)) tri va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) y nang mai hoi. hieu qua ca truc ((va hanh) or (va thanh)) tri va triet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) y nang mai hoi. hieu qua ca truc ((va hanh) or (va thanh)) tri va triet*.