Perhaps you should try some spelling variations:
dang hanh » dang thanh, dang van, dang hung
ban hanh » ban hang
su triet » su viet, su tien
ve triet » va trien
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va am » va lam, va cam

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

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