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

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 nam thuoc van hanh vai ((cua tre) OR (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 nam thuoc van hanh vai ((cua tre) OR (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 nam thuoc van hanh vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang ma) or (dang xay)) hoi. hieu le nam thuoc van hanh vai ((cua tre) OR (cuu tre))*.