Perhaps you should try some spelling variations:
phoi xquang » hoi quang, phi quang, pho quang
tinh dang » tinh dung, binh dang, tinh sang
dang cong » dung cong
hieu soat » hieu suat, hieu hoat, hieu luat
benh phoi » benh hoc, benh noi, benh kho
xquang ma » quang ma, quang va
cong tim » cong kim, cong ti, cong tin
ma bien » may bien, va bien, ma dien
bien so » bien doi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dang cong tim hieu soat ) or ( benh phoi xquang ma bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dang cong tim hieu soat ) OR ( benh phoi xquang ma bien so )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dang cong tim hieu soat ) or ( benh phoi xquang ma bien so ))*.