Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
quan cau » quang cao, toan cau, quan ha
tay lang » tai lang, tay tang, tay quang
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
ty lang » ty xang, ty hang, tu lang
qua cau » qua cac, qua ca, qua cai
luc va » duc va, tuc va, loc va
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 ((ty lang) OR (tay lang)) xa hoi. hieu ((qua cau) OR (quan cau)) luc va hanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty lang) OR (tay lang)) xa hoi. hieu ((qua cau) or (quan cau)) luc va hanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty lang) OR (tay lang)) xa hoi. hieu ((qua cau) or (quan cau)) luc va hanh vi va triet*.