Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tay thoi » tay hoi, tay thai, gay thoi
may hoi » may thoi, tay hoi, mai hoi
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc dan, thuc day
danh vi » hanh vi, dinh vi, danh di
y mang » cay mang
he nam » ha nam, nghe nam
vi hoa » voi hoa, vi hoc, va hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y mang ((may hoi) OR (tay thoi)). hieu he nam ((thuc va) OR (thuc vat)) danh vi hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y mang ((may hoi) or (tay thoi)). hieu he nam ((thuc va) OR (thuc vat)) danh vi hoa viet~".
• Adding a wildcard symbol may retrieve word variants: hoc sach y mang ((may hoi) or (tay thoi)). hieu he nam ((thuc va) OR (thuc vat)) danh vi hoa viet*.