Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nhan dien » nhan vien, nhan dieu, toan dien
nhan dan » phan dau, gian dan, nhan tai
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
hanh de » hanh ve, hanh kem
va cao » va cac, va co, va dao
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: thuat sach y nang o hoi. hieu va cao duc va ((hanh de) or (((nhan dien) OR (nhan dan)))) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang o hoi. hieu va cao duc va ((hanh de) OR (((nhan dien) OR (nhan dan)))) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang o hoi. hieu va cao duc va ((hanh de) or (((nhan dien) OR (nhan dan)))) su triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang o hoi. hieu va cao duc va ((hanh de) or (((nhan dien) OR (nhan dan)))) su triet*.