Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
doanh cua » doanh luan
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
nam mua » nam cua, nam qua, nam xua
cua cua » cua chua, ca cua, qua cua
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, yen lang

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

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