Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
nam thuc » am thuc, nam thu, nam tu
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
hieu le » hieu ve, hieu he, hieu ly
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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 xa) or (dang xay)) hoi. hieu le ((nam thuc) OR (nam thuoc)) van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang xa) OR (dang xay)) hoi. hieu le ((nam thuc) OR (nam thuoc)) van hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang xa) or (dang xay)) hoi. hieu le ((nam thuc) OR (nam thuoc)) van hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang xa) or (dang xay)) hoi. hieu le ((nam thuc) OR (nam thuoc)) van hanh vai cua tre*.