1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)
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COMPOUNDS
có thể xảy ra 
can occur, can happen
không có gì xảy ra nothing happened
những việc xảy ra happenings, events, goings-on
rất dễ xảy ra very likely to happen
sắp sửa xảy ra about to happen
sẽ xảy ra will happen, will take place
vừa xảy ra to have just occurred, just happened
xảy to happen
xảy ra to happen, occur
xảy ra bất ngờ to appear unexpectedly
xảy ra rất thường to happen a lot, take place often
đã xảy ra to have happened, have occurred, have taken place
có thể xảy ra can occur, can happen không có gì xảy ra nothing happened những việc xảy ra happenings, events, goings-on rất dễ xảy ra very likely to happen sắp sửa xảy ra about to happen sẽ xảy ra will happen, will take place vừa xảy ra to have just occurred, just happened xảy to happen xảy ra to happen, occur xảy ra bất ngờ to appear unexpectedly xảy ra rất thường to happen a lot, take place often đã xảy ra to have happened, have occurred, have taken place