Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
ban hanh » ban hang
hanh di » hanh vi, hanh de, hang di
tuc ban » thuc ban, truc ban, tu ban
sach ty » sach y, sach thu, xach tay
dau tuc » dau tu, dao tuc, cau truc
mang xa » lang xa, mang may, dang xay
sach tu » sach thu, cach tu, sach uu
ca tren » cu tren, la tren, co tren
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 ty) OR (sach tu)) mang xa hoi. lieu va dau tuc ban hanh di ((cau tren) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) mang xa hoi. lieu va dau tuc ban hanh di ((cau tren) OR (ca tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach tu)) mang xa hoi. lieu va dau tuc ban hanh di ((cau tren) or (ca tren))*".