Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
di cua » doi cua, de cua, do cua

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 x ho. hieu ve cac tu ((va hanh) or (ban thanh)) ((di cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x ho. hieu ve cac tu ((va hanh) OR (ban thanh)) ((di cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x ho. hieu ve cac tu ((va hanh) or (ban thanh)) ((di cua) or (dai cua)) triet*.