Perhaps you should try some spelling variations:
dang hung » dang quang, manh hung, dang cong
ban hanh » ban hang
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 ca » hieu cac, hieu cua, hieu va
vai su » van su, lai su, tai su
ca am » cua am, ca dam, va am

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