Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va

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: toc sach ky lang xa hoi. hieu va ((nam thu) OR (nam thuoc)) va dan va ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu va ((nam thu) or (nam thuoc)) va dan va ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu va ((nam thu) or (nam thuoc)) va dan va ((cua tre) OR (cuu tre))*.