Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
va tinh » may tinh
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
co hoi » co hoc, co loi
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((o hoi) or (co hoi)). hieu va cam xuc va tinh ((di cua) OR (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((o hoi) OR (co hoi)). hieu va cam xuc va tinh ((di cua) OR (de cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ((o hoi) or (co hoi)). hieu va cam xuc va tinh ((di cua) OR (de cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((o hoi) or (co hoi)). hieu va cam xuc va tinh ((di cua) OR (de cua)) te*.