surveying	surv	0.1374
oil and gas	oil and ga	0.1374
sides	sid	0.1374
Vietsovpetro	vietsovpetr	0.1374
surveying work	surv work	0.0497
shelf	shelf	0.0497
gas deposits	ga deposit	0.0497
joint	joint	0.0497
south of Vietnam	south of vietnam	0.0497
exploration and surveying	explor and surv	0.0497
years	year	0.0497
further	further	0.0497
PROTOCOL	protocol	0.0497