Perhaps you should try some spelling variations:
may thoi » gay thoi, may thi, tay thoi
nam thuc » nam thuoc, am thuc, nam thu
hoc cac » hoc cao
may hoi » tay hoi, mai hoi, may hmi
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
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
cac y » cac ky, cac _, cap y

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc cac y mang ((may hoi) or (may thoi)). hieu he nam thuc va danh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac y mang ((may hoi) OR (may thoi)). hieu he nam thuc va danh vi hoa viet.
• Adding a wildcard symbol may retrieve word variants: hoc cac y mang ((may hoi) or (may thoi)). hieu he nam thuc va danh vi hoa viet*.