Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, dia danh, va thanh
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

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: tu san ky nang ma hoi. hieu va cham soc ((va hanh) OR (((va danh) OR (va dan)))) tri va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ma hoi. hieu va cham soc ((va hanh) or (((va danh) OR (va dan)))) tri va triet~".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoi. hieu va cham soc ((va hanh) or (((va danh) OR (va dan)))) tri va triet*.