इन वाक्यों को ठीक कीजिए।
The man's truculent behaviour of refusing to give a receipt lead to him getting fired.
उस आदमी रसीद मना कर के लड़ाकू व्यवहार से निकाल गया

Children tend to desire attention from their parents.
बच्चों को उनके माता - पिता से ध्यान की इच्छा करते हैं.

Dressing in an unconventional way can attract unwanted attention.
एक अपरंपरागत तरीके से सजाना अवांछित ध्यान आकर्षित कर सकते हैं.I am trying my best to learn Hindi this way. So I request you to please correct these sentences as there are not Google translated, but the ones I think it is. So please, help me.

Question

इन वाक्यों को ठीक कीजिए।
The man's truculent behaviour of refusing to give a receipt lead to him getting fired.
उस आदमी रसीद मना कर के लड़ाकू व्यवहार  से निकाल गया

Children tend to desire attention from their parents. 
बच्चों को उनके माता - पिता से ध्यान की इच्छा करते हैं.

Dressing in an unconventional way can attract unwanted attention. 
एक अपरंपरागत तरीके से सजाना अवांछित ध्यान आकर्षित कर सकते हैं.I am trying my best to learn Hindi this way. So I request you to please correct these sentences as there are not Google translated, but the ones I think it is. So please, help me.

Answer

नोट: All of your questions that I have answered since begining, I found that your many of the sentences are too english by nature(). When we translate them word by word, they may not appear natural in hindi. we might have said things in a different way.

The man's truculent behaviour of refusing to give a receipt lead to him getting fired.
उस आदमी का रसीद ना देने के लिए किया गया उग्र/झगड़ालू व्यव्हार उसके नौकरी से निकाले जाने का कारण बन गया.

Children tend to desire attention from their parents.
बच्चे उनके माता - पिता का ध्यान आकर्षित करने की इच्छा करते हैं.

Dressing in an unconventional way can attract unwanted attention.
एक अपरंपरागत तरीके से कपड़े पहनना अवांछित ध्यान आकर्षित कर सकता है.