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

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 heads) OR ((cheats OR cseats) 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 heads) or ((cheats OR cseats) or cheath)) or cheath)) of mixing and (solution\" or solutions\")".
• Removing quotes may allow a broader search: (heats or (((cheads or heads) or ((cheats OR cseats) or cheath)) or cheath)) of mixing and (solution or solutions ).
• Adding a wildcard symbol may retrieve word variants: "(heats or (((cheads or heads) or ((cheats OR cseats) or cheath)) or cheath)) of mixing and (solution" or solutions")*.