英和和英

on further study

thorough research

need extra help

study the case further

thoroughgoing research

do research

do research

to prosecute a study―pursue a study

do research on the subject

assiduous research

well-funded research

a research grant

meticulous research

Continuation of research

I am proceeding with the study.

study his needs

to investigate and study

painstaking research

research-intensive

more than is needed

revision required

in previous research

to make a deep study of―go deep into―dive into―delve into―a subject

to go deep into a subject―dive into a subject

Tackle research

to cover the same ground

The study enters upon a new phase.

well along in their research

Research of the past

requiring much chewing