Perhaps you should try some spelling variations:
na thuoc » nha thuoc, nam thuoc, va thuoc
dang xay » dang van, van xay
cuu tre » cua tre, cau tren, cau treo
vai cuu » vai cua
van anh » van thanh, tuan anh
hieu le » hieu ve, hieu he, hieu ly
nang ma » tang ma, sang ma, nang cao
sai ky » sac ky
tu sai » tu bai, tu san, tu cai
le na » le nam, le va, le ta

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((nang ma) or (dang xay)) hoi. hieu le na thuoc ((van anh) OR (van minh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang ma) OR (dang xay)) hoi. hieu le na thuoc ((van anh) OR (van minh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang ma) or (dang xay)) hoi. hieu le na thuoc ((van anh) OR (van minh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang ma) or (dang xay)) hoi. hieu le na thuoc ((van anh) OR (van minh)) vai cuu tre*.