Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dau » lanh dao, hang dau, danh tu
chat soc » chat hoc, chat doc, chat song
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
te sach » toc sach
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((x hoi) OR (o hoi)). hieu van ((chat soc) or (cham soc)) va danh dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (o hoi)). hieu van ((chat soc) OR (cham soc)) va danh dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) OR (o hoi)). hieu van ((chat soc) or (cham soc)) va danh dau cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) OR (o hoi)). hieu van ((chat soc) or (cham soc)) va danh dau cua triet*.