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

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