Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thanh cac » hanh cac, thanh bac, tranh cac
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
thanh ca » thanh cha, thanh ha, thanh va
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
cao hoi » cau hoi, co hoi, cao hoc
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang cao hoi. hieu van ((lam duoc) or (nam thuoc)) ma ((thanh ca) or (thanh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang cao hoi. hieu van ((lam duoc) OR (nam thuoc)) ma ((thanh ca) OR (thanh cac)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach v nang cao hoi. hieu van ((lam duoc) or (nam thuoc)) ma ((thanh ca) or (thanh cac)) cua tre*.