Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
thu sac » thu sach, thu san, thu xac
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
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: thu sac ky nang ((x hoi) OR (o hoi)). hieu van nam ((thuc va) or (thuc day)) thanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((x hoi) OR (o hoi)). hieu van nam ((thuc va) OR (thuc day)) thanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((x hoi) OR (o hoi)). hieu van nam ((thuc va) or (thuc day)) thanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((x hoi) OR (o hoi)). hieu van nam ((thuc va) or (thuc day)) thanh di cua triet*.