Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
nam thuc » am thuc, nam thu, nam tu
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
sac ky » cac ky, sai ky
cua te » cua tu

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: su ((sach y) OR (sac ky)) nang xa hoi. hieu he ((nam thuc) OR (nam thuoc)) van thanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sac ky)) nang xa hoi. hieu he ((nam thuc) OR (nam thuoc)) van thanh dai cua te~".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) nang xa hoi. hieu he ((nam thuc) OR (nam thuoc)) van thanh dai cua te*.