Perhaps you should try some spelling variations:
mac nguoi » ma nguoi, mat nguoi, toc nguoi
tac nguoi » toc nguoi, tay nguoi, thuc nguoi
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can
di cua » dai cua, doi cua, de cua
su sac » su sach, su xac
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky nang x hoi. hieu van ((mac nguoi) OR (tac nguoi)) ban hang di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su cac)) ky nang x hoi. hieu van ((mac nguoi) OR (tac nguoi)) ban hang di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su cac)) ky nang x hoi. hieu van ((mac nguoi) OR (tac nguoi)) ban hang di cua tre*.