Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » te sach, tu cach, vu sach
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
nang o » nang co, nang ho, nang ro
di cua » dai cua, doi cua, de cua
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 (su sach))) OR (thu sach)) ky nang o hoi. hieu va cac duc va xanh di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (thu sach)) ky nang o hoi. hieu va cac duc va xanh di cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (su sach))) or (thu sach)) ky nang o hoi. hieu va cac duc va xanh di cua triet*.