Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh moi » thanh loi, thanh hoa, thanh hai
moi quan » mai quan, hai quan, co quan
hieu va » lieu va, hieu qua
dau luc » cau luc, dau luan, dau nuoc
luc ban » duc ban, cuc ban, luc bat
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
va dau » va dao
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang ((x hoi) or (((o hoi) OR (o hai)))). hieu va dau luc ban thanh moi quan tri~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ((x hoi) OR (((o hoi) OR (o hai)))). hieu va dau luc ban thanh moi quan tri.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((x hoi) or (((o hoi) OR (o hai)))). hieu va dau luc ban thanh moi quan tri".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((x hoi) or (((o hoi) OR (o hai)))). hieu va dau luc ban thanh moi quan tri*.