Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ha xuc » hoa xuc, chat xuc
ha duc » ho duc, ha dac, xa duc
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van ((ha xuc) or (ha duc)) ((ban hanh) or (van hanh)) dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu van ((ha xuc) OR (ha duc)) ((ban hanh) OR (van hanh)) dai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu van ((ha xuc) or (ha duc)) ((ban hanh) or (van hanh)) dai cua triet*.