Perhaps you should try some spelling variations:
doan dieu » nhan dieu, toan dien
thuc dan » thuc hanh, hoc dan, thuc vat
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu su » hieu sau, tieu su, hieu so
su kham » su pham, vu kham, so kham
te sai » te tai, te bai, te lai
sai ky » sac ky
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang ma hoi. hieu su kham ((tuc va) or (thuc dan)) ((doan dieu) or (dang dieu)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang ma hoi. hieu su kham ((tuc va) OR (thuc dan)) ((doan dieu) OR (dang dieu)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sai ky nang ma hoi. hieu su kham ((tuc va) or (thuc dan)) ((doan dieu) or (dang dieu)) cua tre*.