Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
can thuc » dan thuc, van thuc, san thuc
cay thuc » cay thuoc, day thuc, cach thuc
van hanh » ban hanh, van anh, van ban
dieu tra » dieu tri, kiem tra, dieu cua
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
tra tre » tran tren, tran tri, tran tro
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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: te sac ky nang xa hoi. hieu va ((can thuc) OR (cay thuc)) ((van hanh) OR (van thanh)) dieu tra tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. hieu va ((can thuc) OR (cay thuc)) ((van hanh) or (van thanh)) dieu tra tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. hieu va ((can thuc) OR (cay thuc)) ((van hanh) or (van thanh)) dieu tra tre*.