Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
xanh tai » hanh tai, anh tai, vanh tai
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va xanh » va danh, va hanh, va anh
tai cua » thai cua, tai cuc, tri cua
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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: ((tu sach) OR (thu sach)) ky nang o hoi. hieu va cac duc va xanh tai cua triet~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang o hoi. hieu va cac duc va xanh tai cua triet*.