Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
dau tren » dau tien, dat tren, dau tieng
may hoi » may thoi, tay hoi, mai hoi
xuc van » duc van, luc van, vuc van
hanh bi » hanh vi, thanh bai, khanh bui
y mang » cay mang
va cau » van cau, va dau, va cao

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 mang may hoi. hieu ((va cau) OR (va cac)) xuc van hanh bi dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y mang may hoi. hieu ((va cau) OR (va cac)) xuc van hanh bi dau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y mang may hoi. hieu ((va cau) OR (va cac)) xuc van hanh bi dau tren*.