Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
va tinh » may tinh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly nang xa hoi. hieu van nam thuoc ((va tinh) or (ban hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang xa hoi. hieu van nam thuoc ((va tinh) OR (ban hanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang xa hoi. hieu van nam thuoc ((va tinh) or (ban hanh)) tai cua tre*.