Perhaps you should try some spelling variations:
heats » heat, heads, heath
cheats » cheat, cheads, cheath, cheaps, wheats, chats
cheads » heads, aheads, chears
cheat » cheap, wheat, chat
cheath » cheaph, wheath, chath, heath, sheath, creath

Try widening your search to All Fields.

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