Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh phan » thanh pho, thanh san, thanh hai
cua triet » cua viet, su triet, va triet
cac luc » cau luc, coc luc, cac nuoc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty xang ((o hoi) or (o hai)). hieu va cac luc va ((thanh phan) OR (thanh toan)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang ((o hoi) OR (o hai)). hieu va cac luc va ((thanh phan) OR (thanh toan)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang ((o hoi) or (o hai)). hieu va cac luc va ((thanh phan) OR (thanh toan)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang ((o hoi) or (o hai)). hieu va cac luc va ((thanh phan) OR (thanh toan)) cua triet*.