Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
dan tai » van tai, dan thi, han tai
dan vai » dan va, dan vat, den vai
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, xa hoi

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