Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
thuoc va » thuoc ma, thuong va, thuoc tai
danh vi » hanh vi, dinh vi, danh di
hoc anh » hoc nganh, hoc nhanh, ngoc anh
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc dan, thuc day
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.

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