Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
dau tren » dau tien, dat tren, dau tieng
tu cach » tu cac
te sach » toc sach
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
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: ((tu cach) or (te sach)) y nang o hoi. hieu van cau duc va hanh vi ((cua triet) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) y nang o hoi. hieu van cau duc va hanh vi ((cua triet) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) y nang o hoi. hieu van cau duc va hanh vi ((cua triet) or (dau tren))*.