Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
dau tuc » dau tu, dao tuc, cau truc
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
di cuu » di cau, di cua, dinh cuu

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