Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
va hanh » va thanh, va danh, ban hanh
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ty hang xa hoi. hieu qua cau luc ((va hanh) OR (van hanh)) vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ty hang xa hoi. hieu qua cau luc ((va hanh) or (van hanh)) vi va triet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) ty hang xa hoi. hieu qua cau luc ((va hanh) or (van hanh)) vi va triet*.