Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
sach ky » sac ky, sach y, sach ty
dan vai » dan va, dan tai, dan vat
cuu tre » cua tre, cau treo
ca dan » cac dan, ca dao

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

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