Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hieu van » thien van, lieu va, hieu ve
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu van) OR (hieu va)) tac tu va hanh lam ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu van) or (hieu va)) tac tu va hanh lam ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu van) or (hieu va)) tac tu va hanh lam ((cua triet) OR (va triet))*.