I'd like to use ADF7030-1 or ADF7021 with MSK modulation method but I can not find that
these chips accept MSK in thier datasheets. Both of them can use MSK modulation?
The radio has no modulation index register or bitfield that you can set. You use the data rate and frequency deviation registers to configure the modulation index. Please read more on FSK by following the link below.
You'll find that "In MSK, the difference between the higher and lower frequency is identical to half the bit rate."