Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc van » thuoc va, thuc van, thuoc ban
doanh cua » doanh luan
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
doanh va » doan va, doanh tai, hanh va
tang ma » mang may, tang van
cuu tre » cua tre, cau tren, cau treo
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa

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 tang ma hoi. hieu van nam thuoc van ((doanh va) OR (doanh cua)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y tang ma hoi. hieu van nam thuoc van ((doanh va) OR (doanh cua)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ma hoi. hieu van nam thuoc van ((doanh va) OR (doanh cua)) cuu tre*.