Perhaps you should try some spelling variations:
dong thanh » truong thanh
thuc dong » thuoc dong, thuc dung, phuc dong
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
thanh do » thanh de, thanh pho, thanh hoa
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
te sach » toc sach
do cua » doi cua, co cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) nham thuc dong thanh do cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) nham thuc dong thanh do cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) nham thuc dong thanh do cua tre*.