Browse more language and linguistic databases here.
Tip #1: When searching library databases or Google, combine keywords for more specific or relevant results. Try combining your overcharging topic, such as first language acquisition, with the themes or subtopics related to your research. Need help brainstorming linguistic topics? Check out the SIL Glossary of Linguistic Terms.
Tip #2: Be creative with your search terms. Think of synonyms or related phrases when searching. For example, first language acquisition is often abbreviated "L1" in journal articles.
Tip #3: Review the bibliography/citations in the journal articles to find more similar research.