Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
hanh di » hanh vi, hanh de, hang di
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
cach tu » cach thuc
va dau » va dao
di cua » dai cua, doi cua, de cua

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 ty) OR (cach tu)) ((nang xa) OR (nang x)) hoi. lieu va dau tuc van hanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (cach tu)) ((nang xa) or (nang x)) hoi. lieu va dau tuc van hanh di cua tre*.