Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu san » hieu van, hieu sau, chieu sang
pham dua » pham duy, pham cua, pham dia
thanh ve » hanh ve, thanh va, thanh vien
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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 sac ky nang xa hoi. hieu san ((pham dua) OR (pham duc)) ban thanh ve ((su triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu san ((pham dua) OR (pham duc)) ban thanh ve ((su triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu san ((pham dua) OR (pham duc)) ban thanh ve ((su triet) or (cua viet))*.