Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
dieu tra » dieu tri, kiem tra, dieu cua
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tra tre » tran tren, tran tri, tran tro

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