Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
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.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang o hoi. lieu va phat ((goc va) or (loc va)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang o hoi. lieu va phat ((goc va) OR (loc va)) hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang o hoi. lieu va phat ((goc va) or (loc va)) hanh di cua triet*.