Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
thuc dan » thuc hanh, hoc dan
dieu tra » dieu tri, kiem tra, dieu cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tra tre » tran tren, tran tri, tran tro
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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: te sach ky nang x hoi. hieu va cau ((thuc vat) OR (thuc dan)) hanh dieu tra tre~.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu va cau ((thuc vat) or (thuc dan)) hanh dieu tra tre*.