In general normal present items can only raise the relationship until a certain point, after that you'll need events or love potions to increase it further.
Did you have the first scene with Ryoko? It requires that you raise her "need for order" by using certain skills in battle. Once it's high enough a new dialog will be displayed when talking with her in your bedroom.
For Chiyo you might need different things depending on which point of her events you're at. Maybe you still need the festival events at Thremten with Mirel and MIra which start with a note on the Aldlyn city board? Or you're not far enough in the main story yet and don't have the mithril pickaxe? Did you have the events with King Merius of Amagal yet?