Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
mai khoi » mai khoa, tai khoa, cac khoi
cham tuc » nham thuc, pham thuc, tham thuc
mai hoi » dai hoi, lai hoi, mai doi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cau » va cau, van cau, lai chau
vai cac » va cac, tai cac, voi cac
va cham » va chat, va tham
sach v » sach va, sach y, sach 2
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang

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 v nang ((mai hoi) or (mai khoi)). hieu va cham tuc va hanh ((vai cau) OR (vai cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang ((mai hoi) OR (mai khoi)). hieu va cham tuc va hanh ((vai cau) OR (vai cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang ((mai hoi) or (mai khoi)). hieu va cham tuc va hanh ((vai cau) OR (vai cac)) tren".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang ((mai hoi) or (mai khoi)). hieu va cham tuc va hanh ((vai cau) OR (vai cac)) tren*.