Perhaps you should try some spelling variations:
thuoc phap » thuoc phai, thuc pham, theo phap
chua tre » chua tri, cua tre, chua trieu
trinh va » trinh van, trinh vat, trinh ve
hoc phap » hoc phan, hoc phat, hoc pho
hieu van » hieu va, thien van, lieu va
va chua » vua chua, ca chua, va chu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
van lam » van nam

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 x)) hoi. hieu van lam ((thuoc phap) OR (hoc phap)) trinh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu van lam ((thuoc phap) OR (hoc phap)) trinh va chua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang x)) hoi. hieu van lam ((thuoc phap) OR (hoc phap)) trinh va chua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. hieu van lam ((thuoc phap) OR (hoc phap)) trinh va chua tre*.