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

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 ((nang xa) OR (nang x)) hoi. lieu va dau tuc ((van hanh) OR (van anh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. lieu va dau tuc ((van hanh) OR (van anh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. lieu va dau tuc ((van hanh) OR (van anh)) di cua tre*.