Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
lam duoc » nam duoc, luat duoc, tao duoc
thanh ca » thanh cha, thanh cac, thanh ha
ma thanh » mai thanh, va thanh, ha thanh
so sach » so sanh, bo sach, co sach
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ca cua » co cua

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 y nang ((cao hoi) OR (cao hoc)). lieu va ((lam duoc) or (lam thuoc)) ma thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((cao hoi) OR (cao hoc)). lieu va ((lam duoc) OR (lam thuoc)) ma thanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((cao hoi) OR (cao hoc)). lieu va ((lam duoc) or (lam thuoc)) ma thanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((cao hoi) OR (cao hoc)). lieu va ((lam duoc) or (lam thuoc)) ma thanh ca cua tre*.