Perhaps you should try some spelling variations:
ban hang » ngan hang
nang mo » nang meo, nang ma, nang co
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
mo hoc » mon hoc, co hoc
di cuu » di cau, di cua, dinh cuu

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

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