Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
lam thuoc » nam thuoc, am thuc, nam thuc
thanh ca » thanh cha, thanh cac, thanh ha
hieu van » hieu va, thien van, lieu va
ma thanh » mai thanh, va thanh, ha thanh
lam duoc » nam duoc, luat duoc, tao duoc
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
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. hieu van ((lam duoc) or (((lam thuoc) OR (cay 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. hieu van ((lam duoc) OR (((lam thuoc) OR (cay 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. hieu van ((lam duoc) or (((lam thuoc) OR (cay thuoc)))) ma thanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. hieu van ((lam duoc) or (((lam thuoc) OR (cay thuoc)))) ma thanh ca cua tre*.