Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
luc ban » duc ban, cuc ban, luc bat
cac luc » cau luc, coc luc, cac nuoc
so sach » so sanh, bo sach, co sach
hieu ve » hieu va
tang ma » tang van
sach 7 » sach y, sach 2

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 7 ((tang ma) or (mang may)) hoi. ((hieu ve) OR (hieu van)) cac luc ban thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach 7 ((tang ma) OR (mang may)) hoi. ((hieu ve) OR (hieu van)) cac luc ban thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach 7 ((tang ma) or (mang may)) hoi. ((hieu ve) OR (hieu van)) cac luc ban thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach 7 ((tang ma) or (mang may)) hoi. ((hieu ve) OR (hieu van)) cac luc ban thanh vai cua triet*.