Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hieu phan » phieu phan, lieu phan, hieu pham
su triet » su viet, su tien, ve triet
phan dau » phan tu, hang dau
dau luc » cau luc, dau luan, dau nuoc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
co hoi » co hoc, co loi
y hang » ly hang, ty hang, yu hang
luc va » duc va, tuc va, loc va

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 hang) or (ty xang)) co hoi. hieu phan dau luc va hanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y hang) OR (ty xang)) co hoi. hieu phan dau luc va hanh vi ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((y hang) or (ty xang)) co hoi. hieu phan dau luc va hanh vi ((cua triet) or (su triet))*.