Perhaps you should try some spelling variations:
dong thanh » truong thanh
nham thuc » nhan thuc, nam thuc, nham thu
thuc dong » thuoc dong, thuc dung, phuc dong
van nham » van nam, van nhan, van tham
thanh ca » thanh cha, thanh cac, thanh ha
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cuu tre » cau tren, cau treo

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 van nham thuc dong thanh ca ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (te sach)) ky nang xa hoi. hieu van nham thuc dong thanh ca ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (te sach)) ky nang xa hoi. hieu van nham thuc dong thanh ca ((cua tre) OR (cuu tre))*.