Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cham tuc » nham thuc, pham thuc, tham thuc
mai khoi » mai khoa, tai khoa, cac khoi
cau tren » cu tren, dau tren, ca tren
mai hoi » dai hoi, lai hoi, mai doi
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
vai cau » va cau, van cau, vai cac
sach v » sach y, sach 2, sach vay
tuc va » thuc va, truc va, tuc xa

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