Perhaps you should try some spelling variations:
heats » heads, heath, seats
cheats » cheads, cheath, cseats, cheaps, wheats, chats
heat » head
cheat » chead, cheap, wheat, chat
cheads » heads, aheads, chears

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

• If you are trying to use Boolean operators, they must be ALL CAPS: "((heats OR heat) OR ((cheads OR cheats) OR cheat)) of mixing AND (solution" or solutions").
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((heats OR heat) or ((cheads or cheats) or cheat)) of mixing and (solution\" or solutions\")".
• Removing quotes may allow a broader search: ((heats OR heat) or ((cheads or cheats) or cheat)) of mixing and (solution or solutions ).
• Adding a wildcard symbol may retrieve word variants: "((heats OR heat) or ((cheads or cheats) or cheat)) of mixing and (solution" or solutions")*.