The aircraft disappeared between Kuala Lumpur and Beijing on 8 March 2014 with 239 people on board.
Australian-led search teams are combing a 120,000 sq km (46,330 sq mile) area of the southern Indian Ocean.
Only one confirmed piece of debris, a part of wing called a flaperon, has been found, on Reunion Island.
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Malaysian investigators say key information is still being reviewed.
"At this time, the team is continuing to work towards finalising its analysis, findings, conclusions and safety recommendations on eight relevant areas associated with the disappearance of flight MH370 based on relevant information," lead investigator Kok Soo Choon said in a statement on state television on Tuesday.
Grace Nathan, whose mother was on board MH370, says she and other relatives desperately want the search to go on until it is found
The investigating team is led by Malaysia and includes experts from the US, China, Australia, France and Britain.
The search for the wreckage is estimated to have cost more than $130m (£92m).
The countries have said it will end once the current search area has been completely covered, likely to be around June.
Malaysian Prime Minister Najib Razak said he remained "hopeful that MH370 will be found", but once the search zone is exhausted the three governments would meet to determine the way forward.
"We remain committed to doing everything within our means to solving what is an agonising mystery for the loved ones of those who were lost," he said in a statement.
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