Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » 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
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va dau » va dao

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 tu ((van thanh) OR (ban thanh)) di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. lieu va dau tu ((van thanh) OR (ban thanh)) di ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. lieu va dau tu ((van thanh) OR (ban thanh)) di ((cua tre) or (cuu tre))*".