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
so sach » so sanh, bo sach, co sach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
do cua » doi cua, de cua, dong cua
co cua » con cua, ca cua, cong 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 nham thuc dong thanh ((do cua) OR (co 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 nham thuc dong thanh ((do cua) OR (co cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (te sach)) ky nang xa hoi. hieu ve nham thuc dong thanh ((do cua) OR (co cua)) tre*.