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

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