verb
1
BAD : I'd like to find why nobody likes me.
GOOD : I'd like to find out why nobody likes me.
BAD : The doctors are trying to find what is wrong with him.
GOOD : The doctors are trying to find out what is wrong with him.
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find = discover something by chance or by looking for it: 'Did you ever find the sunglasses you lost?' 'I can't find my comb. Have you seen it anywhere?'
find out = get information about something that you want to know: 'He's gone to find out which gate the plane leaves from.' 'I think we should find out exactly what's missing before we start accusing people.'
2
BAD : Nurses find very difficult to start a family while they are working.
GOOD : Nurses find it very difficult to start a family while they are working.
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find + it + easy/difficult/impossible to do sth : 'I find it hard to concentrate when I'm hungry.' 'You might find it interesting to spend a few hours at the museum.'