Perhaps you should try some spelling variations:
thuoc phap » thuoc phai, thuc pham, hoc phap
phap tinh » phap sinh, phap tieng, phap tang
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
tinh va » tich va, trinh van, trinh vat
van lam » van nam
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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 ky ((((nang xa) or (nang ma))) or (nang x)) hoi. hieu van lam thuoc phap tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang xa) OR (nang ma))) OR (nang x)) hoi. hieu van lam thuoc phap tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang xa) or (nang ma))) or (nang x)) hoi. hieu van lam thuoc phap tinh va cua tre*.