The phrase "may have completed" is correct and usable in written English.
You can use this phrase when you are uncertain about something being completed. For example, "I may have completed the project, but I'm not sure".
For the Burmese junta, the discovery of Yaza Gaha Thiri Pissaya Gaza Yaza may have completed the set.
However, it is possible that the students who did not attend class may have completed the quizzes after they studied.
On a related note, it is possible that students who did not attend class may have completed the quizzes after they studied.
Worker agents in some subsystems might be working to achieve their goals, while worker agents in other subsystems may have completed theirs.
Our findings suggest veterans with below average PGSs for educational attainment may have completed fewer years of schooling than comparable non-veterans.
It can be inferred from Mou's observation that older workers who may have completed their college education years ago, may have found it difficult to make the necessary technical adjustments.
She arrived back at Groton, Connecticut, on 10 May, having completed the first submerged circumnavigation of the earth.
The DMUs are port authorities, which may have complete control over the outputs, provided that the carriers are the agents selling container storage space and transporting containers.
So even though a potential enrollee may have complete faith in your service and reputation, they may be unnerved by the pathways of information exchange: the Internet, mobiles, wireless networks, computers.
It is likely that patients requiring mastectomies and chemotherapy may not have completed treatment by one year after diagnosis and patients may also be retained because of anxiety.
She may never have completed her studies, but Schendel remained a philosopher to the last.
