cố 
(1) to make an effort, try (very hard); (2) great grandfather; (3) to pawn; (4) reason; (5) old, former, late (deceased); (6) intentional, premeditated; (7) firm, strong; (8) innate, original; (9) to look after, care for, turn one’s head [ cố ] : (1) to make an effort, try (very hard); (2) great grandfather; (3) to pawn; (4) reason; (5) old, former, late (deceased); (6) intentional, premeditated; (7) firm, strong; (8) innate, original; (9) to look after, care for, turn one’s head
Rhyme Family: Ô
cố Most Common Compounds Set 1:
cố cố định cố gắng sự cố củng cố kiên cố Most Common Compounds Set 2 :
cố cố định cố gắng cố hữu cố tình cố vấn củng cố gia cố sự cố 
I bought a new cup. 
Ich habe eine neue Tasse gekauft.