Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
thuoc de » thuoc do, thuoc he, thuoc dieu
de thanh » le thanh
thanh do » thanh de, thanh pho, thanh hoa
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
do cua » doi cua, co cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky ((nang xa) or (nang ma)) hoi. hieu van nam thuoc de thanh do cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((nang xa) OR (nang ma)) hoi. hieu van nam thuoc de thanh do cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((nang xa) or (nang ma)) hoi. hieu van nam thuoc de thanh do cua tre*.