Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau thuc » cau truc, cuu thuc, can thuc
dieu tra » dieu tri, kiem tra, dieu cua
van hanh » ban hanh, van anh, van ban
tra tri » tran tri, tra trinh, trang tri
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cau » van cau, va cac, va dau

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