Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
thiet » thieu

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 dang xa hoi. hieu qua ((cac tuc) OR (cac tac)) va hanh vi ((va triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu qua ((cac tuc) OR (cac tac)) va hanh vi ((va triet) or (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu qua ((cac tuc) OR (cac tac)) va hanh vi ((va triet) or (va thiet))*.