Perhaps you should try some spelling variations:
heats » cheats, heat, heads
cheat » cheap, wheat, chat
hears » hearts, years, heart
spears » spear, speare, speakers
speaks » speak, speakers
sheath » heath
solution » solutions

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 ((hears OR (spears OR speaks)) OR sheath)) of mixing AND solution.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((heats or cheat) or ((hears or (spears OR speaks)) or sheath)) of mixing and solution".
• Adding a wildcard symbol may retrieve word variants: ((heats or cheat) or ((hears or (spears OR speaks)) or sheath)) of mixing and solution*.