Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nhan thuc » nhan luc, dan thuc, toan thuc
toc sac » toc sach, hoc sach, doc sach
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
nang o » nang co, nang ho, nang ro
vat va » dat va
va dai » va dao, vi dai, va dau
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: ((toc sac) OR (toc san)) ky nang o hoi. hieu va nhan thuc vat va dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc san)) ky nang o hoi. hieu va nhan thuc vat va dai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (toc san)) ky nang o hoi. hieu va nhan thuc vat va dai cua triet*.