Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
lam duoc » nam duoc, luat duoc, tao duoc
ma thanh » mai thanh, ha thanh, ta thanh
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)) ((ma thanh) OR (va 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)) ((ma thanh) OR (va 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)) ((ma thanh) OR (va 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)) ((ma thanh) OR (va thanh)) ca cua tre*.