Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc van » thuoc va, thuc van, thuoc ban
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
doanh va » doanh tai, doanh cua, hanh va
cuu tre » cua tre, cau tren, cau treo
y sang » _ sang, duy sang
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y sang ((ma hoi) OR (xa hoi)). hieu van nam thuoc van ((doanh va) or (doan va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y sang ((ma hoi) OR (xa hoi)). hieu van nam thuoc van ((doanh va) OR (doan va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y sang ((ma hoi) OR (xa hoi)). hieu van nam thuoc van ((doanh va) or (doan va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y sang ((ma hoi) OR (xa hoi)). hieu van nam thuoc van ((doanh va) or (doan va)) cuu tre*.