There are several synonyms for the phrase "does something for," which means to perform an action on behalf of someone or to benefit someone. Depending on the context, one might use words such as "helps," "supports," "assists," "benefits," "aid," "serve," or "facilitate" to convey a similar meaning. For example, one might say "I can assist you with that project," instead of "I can do something for you regarding that project." When choosing a synonym, it's important to consider the tone of the message and the level of formality required. However, all of these words essentially express a desire to help or support someone else.