Perhaps you should try some spelling variations:
ban hang » ngan hang
cuu tre » cua tre, cau tren, cau treo
va danh » va dinh, va dan, va hanh
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam ky » cao ky, cac ky
di cuu » di cau, di cua, dinh cuu
tu cam » tu cham, tu cac, tu nam
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cam ky nang x hoi. ((hieu ve) OR (hieu va)) cham soc ((ban hang) or (va danh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cam ky nang x hoi. ((hieu ve) OR (hieu va)) cham soc ((ban hang) OR (va danh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cam ky nang x hoi. ((hieu ve) OR (hieu va)) cham soc ((ban hang) or (va danh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang x hoi. ((hieu ve) OR (hieu va)) cham soc ((ban hang) or (va danh)) di cuu tre*.