Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh van » thanh san, thanh toan, thanh phan
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
van cua » vang cua, ban cua, dan cua
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
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) OR (thu sach)) ty nang ((o hoi) or (o hai)). hieu va cac luc va thanh van cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang ((o hoi) OR (o hai)). hieu va cac luc va thanh van cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang ((o hoi) or (o hai)). hieu va cac luc va thanh van cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang ((o hoi) or (o hai)). hieu va cac luc va thanh van cua triet*.