You can use Mathtype, a good formula editing software. It can be embedded in WORD or used alone, with good effect, many symbols and convenient calling.

Answer supplement:

The shortcut keys of formula editor in word need to be set by yourself. You can customize from View-Toolbar, press the keyboard in the pop-up dialog box, select Insert in the pop-up dialog box, select InserEquation in the command box, display the cursor in the "Please Press New Shortcut" box, and press the shortcut you want to set in the "Current Shortcut" box (for example, press Alt and I at the same time), and the shortcut you set (for example, Alt+I) will be displayed, and all the dialog boxes will be closed to complete the setting. In WORD, just press this shortcut key to pop up the formula editor.

Just try chemoffice in chemistry ~