Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
ban hanh » ban hang
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
tuc ban » thuc ban, truc ban, tu ban
dau tuc » dau tu, dao tuc, cau truc
ty hang » ly hang, ty xang, thi hang
ty mang » ty xang, tin mang, tri mang
cu tren » tu tren, dua 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 mang) or (ty hang)) xa hoi. lieu va dau tuc ban hanh di ((cau tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty mang) OR (ty hang)) xa hoi. lieu va dau tuc ban hanh di ((cau tren) OR (cu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty mang) or (ty hang)) xa hoi. lieu va dau tuc ban hanh di ((cau tren) OR (cu tren))*".