If I were to express this sentiment I would do so as follows "Sometimes a simple word of encouragement or a smile means a lot to someone, I wish more people would do something nice for people who need help." By stating "I hope more people can do something nice to whoever needs help." It implies that you want people to do something they cannot currently do "can do" rather than "would do" which would mean they have the ability but lack the inclination to. Good effort :-)

Firm = Hard but pliable, e.g. This tennis ball is firm or The meat is ready when it is firm to the touch Solid = Does not move/compress/bend e.g. The ground underfoot is solid or The ice cream is frozen solid Stiff = inflexible e.g. My knee is feeling stiff today or The door is stiff when opening Hard = Has a double meaning. Hard as in this test is hard (difficult) or the cheese is hard (not soft) e.g. This hammer is very hard or He slept on a hard bed. Tough = Again can have a double meaning. The meat is tough (Chewy, difficult to eat) or the test is a tough one (Difficult) Some are interchangeable without change of meaning. so for example the following statements are basically the same. The ground is hard The ground is solid

Having had a quick look at that website the whole section "Our Vanishing Night" is poorly written and has a number of spelling and grammatical errors, looking at the site it seems to be pretty poor generally . As Timo stated it makes no sense to a native English speaker.