Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
bay dua » cay dua, chay dua
dua ban » dia ban, cua ban, qua ban
van cua » vang cua, ban cua, nan cua
dan cua » dan ca, ban cua, dai cua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
va bay » van bay, va bai, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((ma hoi) or (ma hoa)). hieu va bay dua ban thanh ((van cua) OR (dan cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((ma hoi) OR (ma hoa)). hieu va bay dua ban thanh ((van cua) OR (dan cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((ma hoi) or (ma hoa)). hieu va bay dua ban thanh ((van cua) OR (dan cua)) triet*".