Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
duc minh » duc anh
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
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: su sach y nang o hoi. hieu va cham ((duc van) or (duc minh)) hanh vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o hoi. hieu va cham ((duc van) OR (duc minh)) hanh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang o hoi. hieu va cham ((duc van) or (duc minh)) hanh vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hoi. hieu va cham ((duc van) or (duc minh)) hanh vi ((cua triet) OR (va triet))*.