Perhaps you should try some spelling variations:
thuoc phap » thuoc phai, thuc pham, hoc phap
phap sinh » phau sinh, phai sinh, phap tinh
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
sinh via » sinh va, sinh vien, sinh viec
via cua » gia cua, gian cua, giau cua
van lam » van nam
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
mang xa » lang xa, mang may, dang xay
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: ((tu sach) OR (su sach)) y ((mang xa) or (nang x)) hoi. hieu van lam thuoc phap sinh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y ((mang xa) OR (nang x)) hoi. hieu van lam thuoc phap sinh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y ((mang xa) or (nang x)) hoi. hieu van lam thuoc phap sinh via cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y ((mang xa) or (nang x)) hoi. hieu van lam thuoc phap sinh via cua tre*.