Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
dan vai » dan va, dan tai, den vai
dan vat » dang vat, van vat, dan va
cua tre » cua te, cuu tre, cua triet

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 lang xa hoi. lieu va ((nam thuc) or (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. lieu va ((nam thuc) OR (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. lieu va ((nam thuc) or (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. lieu va ((nam thuc) or (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre*.