Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
su sach » so sach
vu sach » vu bach, vu khach
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dau
vu va » vu van, tu va, su va

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: ((su sach) OR (vu sach)) ky nang x ho. hieu va cam tuc ((va hanh) OR (va dan)) vu va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang x ho. hieu va cam tuc ((va hanh) or (va dan)) vu va triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang x ho. hieu va cam tuc ((va hanh) or (va dan)) vu va triet*.