Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
nham thuc » nhan thuc, nam thuc, nham thu
thanh hai » thanh phan, thanh hoa, thanh san
thuc dang » thuoc dang, thuc dan, thuc dung
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
so sach » so sanh, bo sach, co sach
hai cua » thai cua, dai cua, hoi cua
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
cua te » cua tu
ma hoi » mai hoi, ma hoa, me hoi

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 ((thu nang) OR (thu hang)) ((ma hoi) OR (xa hoi)). hieu va nham thuc dang thanh hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) or (thu hang)) ((ma hoi) OR (xa hoi)). hieu va nham thuc dang thanh hai cua te~".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu hang)) ((ma hoi) OR (xa hoi)). hieu va nham thuc dang thanh hai cua te*.