Vietnam successfully produces Kovid vaccine more than 90% effective

Vietnam successfully produces Kovid vaccine more than 90% effective.មានអ្នកចង់ចាក់ទេវៀតណាមផលិតវ៉ាក់សាំងកូវីដជោគជ័យប្រសិទ្ធភាព90%តែ....

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