For words not found in static PDFs, consider these highly-rated digital tools:
: Many popular trilingual dictionaries use images to bridge the gap between different writing systems, which is especially helpful for Mandarin Chinese characters (Hanzi) and Pinyin. english vietnamese chinese trilingual dictionary pdf link
These are specifically designed for students and focus on high-frequency classroom and everyday vocabulary. For words not found in static PDFs, consider
A sample or full version is often hosted on Nhan Tri Viet or community upload sites like Scribd PONS Trilingual Visual Dictionary english vietnamese chinese trilingual dictionary pdf link
Finding a specific requires a bit of digital archaeology. The big search engines often hide these niche gems behind spam walls. Use the academic portals (Archive.org, GitHub) and the "Save as PDF" hack on specialized dictionary websites (Hanzii, Glosbe).