Perhaps you should try some spelling variations:
dang hanh » dang thanh, dang van, dang hung
ban hanh » ban hang
su triet » su viet, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ha » hieu hoa, hieu va, hieu ca
su tien » su kien, su hien, tu tieng
ha am » hoa am, ha nam, ha lam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu ha am thuc ((dang hanh) OR (ban hanh)) vai ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ha am thuc ((dang hanh) OR (ban hanh)) vai ((su triet) OR (su tien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ha am thuc ((dang hanh) OR (ban hanh)) vai ((su triet) or (su tien))*".