Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, 5 hoi
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: thu sach ky nang ((((x hoi) OR (o hoi))) OR (x ho)). hieu van nam thuc va thanh di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((((x hoi) OR (o hoi))) or (x ho)). hieu van nam thuc va thanh di cua triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((((x hoi) OR (o hoi))) or (x ho)). hieu van nam thuc va thanh di cua triet*.