Perhaps you should try some spelling variations:
dieu tran » dieu trang, dieu tra, kieu trang
hanh dieu » han dieu, hinh dieu, hoang dieu
tran tro » tran troi, tran tri, tran trong
cau thuc » cau truc, cuu thuc, can thuc
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
toc sach » hoc sach, doc sach, thuoc sach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
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) OR (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cau thuc van hanh dieu tran tro~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cau thuc van hanh dieu tran tro~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cau thuc van hanh dieu tran tro*.