Compound Words. Tip #3: Hyphenated Compound Words
There are a great many grammar rules regarding hyphens in compound words. One important rule of thumb to remember is that in most cases, a compound adjective is hyphenated if placed before the noun it modifies, but not if placed after the noun.
Example: a long-term solution- долгосрочное решение
But…
Example: This is not a good solution for the long term.- Это не является хорошим решением в долгосрочной перспективе.
This is just one of many rules concerning hyphens in compound words and it is often necessary to consult the dictionary to determine whether these terms should be hyphenated or not.