There is no term "dhamma vicaya".
However, "dhammavicayasambhojjhan.go"- is a compound of dhamma + vicaya + sambhojjhan.ga.
"dhammavicayasambhojjhan.go" is one of the seven bodhi-factors.
Thus it is not known to 'mere worldlings' (puthujjana).
Here it appears to mean to discriminate between right and wrong dhammas and to select the right ones. The reason for saying so is the context in which it appears.
It is not investigation.
There is no word called vicinati in the Buddha-desnaa. May be later texts.
 D. G. D. C. Wijeratna




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