When exploring a specific topic, it is important to widen your vocabulary and use synonyms for frequently-used phrases, such as "looked into". Some examples of synonyms for "looked into" include "investigated", "examined", "explored", "delved into", "probed", "scrutinized", "researched", "studied", "analyzed", "surveyed", and "inspected". Each of these synonyms adds a different dimension to the meaning of "looked into" that can help you convey a more precise idea of your actions and focus on the subject at hand. By using synonyms, you can enhance your writing and ensure that your message reaches your audience in an effective and compelling manner.