Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
dau tuc » dau tu, dao tuc, cau truc
cua tre » cua te, cuu tre, cua triet
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu nang xa hoi. lieu va dau tuc ((van hanh) or (ban hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. lieu va dau tuc ((van hanh) OR (ban hanh)) di cua tre*.