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

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 ((cheat OR ((cheads OR heads) OR cheats)) OR sheath)) of mixing AND (solution" or solutions").
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(heats or ((cheat or ((cheads OR heads) or cheats)) or sheath)) of mixing and (solution\" or solutions\")".
• Removing quotes may allow a broader search: (heats or ((cheat or ((cheads OR heads) or cheats)) or sheath)) of mixing and (solution or solutions ).
• Adding a wildcard symbol may retrieve word variants: "(heats or ((cheat or ((cheads OR heads) or cheats)) or sheath)) of mixing and (solution" or solutions")*.