Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
va dau » va dao
di cuu » di cua, dinh cuu
di cau » da cau, diem cau

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 ty lang xa hoi. lieu va dau tuc van hanh ((di cuu) or (di cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty lang xa hoi. lieu va dau tuc van hanh ((di cuu) OR (di cau)) tre*.