Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
tay lang » tai lang, tay tang, tay quang
quan cau » quang cao, toan cau, quan ha
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
qua cau » qua cac, qua ca, qua cai
ty lang » ty xang, ty hang, tu lang
luc va » duc va, tuc va, loc va
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty lang) OR (tay lang)) xa hoi. hieu ((qua cau) or (quan cau)) luc va hanh vai va triet~.
• 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 vai 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 vai va triet*".