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I think you have found the right words. Maybe these quotes will help:
Common Sense Remedies for Cough http://www.holistic-online.com/Remedies ... -cough.htm
Boutenko,Igor, "RUSSIAN BANYA (STEAM...

Collins Russian Dictionary 82 (2003)
Encarta(R) World English Dictionary [North American Edition] (2006) http://encarta.msn.com/thesaurus_/toughen.html

While both "harden" and "toughen" can mean...