To select a PDF font that matches the language you’re using Zoho Books in,follow the below steps.
Click the Gear icon on the top right.
Select the Templates sub-tab. Hover over your default template and click Edit.
Under Template Properties, select the font of your choice from the drop down under PDF font.
As you flip through the font styles, a pop up at the bottom announces the language that particular style supports (Chinese, Japanese etc.). This will assist you in selecting the right font style for your PDF. Save your changes before proceeding.