Perhaps you should try some spelling variations:
cua triet » su triet, va triet
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, nam duoc
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 va ((cam duc) or (pham duc)) van hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu va ((cam duc) OR (pham duc)) van hanh vi ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu va ((cam duc) or (pham duc)) van hanh vi ((cua triet) or (cua viet))*.