Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
hieu va » lieu va, hieu qua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
loc va » luc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu va cam ((loc va) or (hoc va)) thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu va cam ((loc va) OR (hoc va)) thanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((ma hoi) OR (xa hoi)). hieu va cam ((loc va) or (hoc va)) thanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu va cam ((loc va) or (hoc va)) thanh vi cua vat*.