Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc day » thuc day, thuoc dac, thuoc dang
thanh doi » thanh moi, thanh do, thanh hoai
thanh loi » thanh hoa, thanh hai, thanh lap
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
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. hieu van nam thuoc day ((thanh doi) OR (thanh loi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu van nam thuoc day ((thanh doi) OR (thanh loi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu van nam thuoc day ((thanh doi) OR (thanh loi)) cua tre*.