Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
su triet » su viet, su tien, ve triet
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
hanh de » hanh ve, hanh kem
hang vi » hang va, hanh vi, hang di
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly 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: thuat sach y nang o hoi. lieu va ((cam duc) OR (cao duc)) va ((hanh de) or (hang vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang o hoi. lieu va ((cam duc) OR (cao duc)) va ((hanh de) OR (hang vi)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang o hoi. lieu va ((cam duc) OR (cao duc)) va ((hanh de) or (hang vi)) su triet*".