Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, may nang
va cao » va cac, va co, va dao
v nang » va nang, vu nang, van nang
tuc va » thuc va, truc va, tuc xa
vai va » mai va, dai va, hai va
va cam » va cham, va cac, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) OR (v nang)) ma hoi. hieu ((va cam) or (va cao)) tuc va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) ma hoi. hieu ((va cam) OR (va cao)) tuc va hanh vai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) ma hoi. hieu ((va cam) or (va cao)) tuc va hanh vai va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) ma hoi. hieu ((va cam) or (va cao)) tuc va hanh vai va triet*.