Perhaps you should try some spelling variations:
va triet » va thiet, va trien, cua triet
ve triet » va trien, su triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac duc » cao duc, cac dac, cac nuoc
va hanh » van hanh, va thanh, va danh
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky lang xa hoi. hieu qua ((cac duc) OR (cac du)) va hanh vi ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky lang xa hoi. hieu qua ((cac duc) OR (cac du)) va hanh vi ((va triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky lang xa hoi. hieu qua ((cac duc) OR (cac du)) va hanh vi ((va triet) or (ve triet))*".