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

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) OR (hieu van)) pham dua 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) OR (hieu van)) pham dua ban thanh ve ((su triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. ((hieu san) OR (hieu van)) pham dua ban thanh ve ((su triet) or (cua viet))*.