Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hai chuc » hoi chuc, hai chu, hai cuc
hieu van » hieu va, thien van, lieu va
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
tu sach » thu sach, su sach, te sach
chuc va » thuc va, thuc vat
van hai » van ha, van chat, van hanh
sach 2 » sach y
nang o » nang co, nang ho, nang ro
2 nang » v nang
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 sach 2 nang o hoi. hieu van hai chuc va ((hanh di) or (hanh de)) ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang o hoi. hieu van hai chuc va ((hanh di) OR (hanh de)) ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 2 nang o hoi. hieu van hai chuc va ((hanh di) or (hanh de)) ((cua triet) OR (va triet))*".