PHNOM PENH, March 19 -- Cambodia has found no sign of the missing Malaysian Airlines flight MH370 at its sea after the country has conducted search operations since Tuesday, a search team leader said Wednesday evening.

"We have been using four helicopters and two naval vessels to search at islands and maritime zone near Vietnamese border since Tuesday, but have not found any trace of the missing flight MH370, " Vice Admiral Tea Sokha, commander of the Cambodian Maritime Space, told Xinhua over telephone. "Search operations are still going on."

The Cambodian Ministry of Defense on Tuesday also ordered every unit under the command of Infantry, Navy and Air Force and other units, which are based on the islands and surveillance vessels patrolling along the Cambodian maritime zone, to be actively engaged with the fishermen in the search for any signals of the missing plane.

"The Ministry of Defense vows to actively join with other countries to search for the missing jetliner and is ready to help facilitate and support the China-Malaysia search and rescue team if they are willing to come to Cambodia for further search or investigation," the ministry said in a statement.

The flight MH 370, carrying 239 people,including 154 Chinese nationals en route from Kuala Lumpur to Beijing, mysteriously disappeared from radar in the early hours of March 8.

Malaysia on Saturday decided to shift the search to one of the two possible corridors -- a northern one from the border of Kazakhstan and Turkmenistan to northern Thailand, and a southern one stretching from Indonesia to the southern Indian Ocean.

Malaysia's acting Transport Minister Hishammuddin Hussein said the number of countries involved in the search and rescue operations had risen to 26 on Monday.