Perhaps you should try some spelling variations:
quoc quan » qua quan, luc quan, hoc quan
ve triet » va trien
su triet » su viet, su tien
cuc ban » cua ban, cac ban, cuu ban
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
sai ky » sac ky
tu sai » tu bai, tu san, tu cai

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: tu sai ky tang ma hoa. hieu ve chat ((cuc ban) OR (quoc quan)) hanh vi ((su triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky tang ma hoa. hieu ve chat ((cuc ban) or (quoc quan)) hanh vi ((su triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky tang ma hoa. hieu ve chat ((cuc ban) or (quoc quan)) hanh vi ((su triet) OR (ve triet))*.