Hey my name is wambui an international student.Im a nursing major and
i heard that there are schools or hospitals that pay tuition fee for
you all through your nursing program and in return,you work for them
for two years and they issue you with a greencard.Can you help me find
one especially in California?

The best way to find out which hospitals offer tuition assistance is
to contact the hospitals themselves.  I know of 3 hospital
conglomerates in the Phoenix area that offer tuition assistance. 
Banner Hospitals, Scottsdale Healthcare Hospitals, and Chandler
Regional Hospitals all offer varying programs.  Scottdale Healthcare
offers up to $5,200 for tuition and books if a person is employed
there and has parttime (16 hrs a week) or fulltime (36 hrs) status. 
Good luck.