Perhaps you should try some spelling variations:
ban hang » ngan hang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
nang o » nang co, nang ho, nang ro
di cuu » di cau, di cua, dinh cuu
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve 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 o hoi. hieu ve cham soc ((ban hang) OR (va danh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang o hoi. hieu ve cham soc ((ban hang) or (va danh)) di cuu tre*.