Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
thanh do » thanh de, thanh pho, thanh hoa
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
tu ban » thu ban, te ban
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, me hoi
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang ((ma hoi) or (ma hoa)). hieu ve cac tu ban thanh do ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ((ma hoi) OR (ma hoa)). hieu ve cac tu ban thanh do ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang ((ma hoi) or (ma hoa)). hieu ve cac tu ban thanh do ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((ma hoi) or (ma hoa)). hieu ve cac tu ban thanh do ((cua triet) OR (su triet))*.