We can't blame chinese women soccer team. They have done everything they could.
Technique is not the only factor in a soccer game. Tactic plays more important role. Had the canadian team score early, they wouldn't have played that ugly defensive game, would they? That's their smart tactic. Actually, in the last 15 minutes, they started counter-attack and almost scored another one. I just happened to know that the canadian coach is the Norwaygean who led Norway to win the WC in 1995.
If we just take a look at the women's soccer population in china and canada, it's not that hard to conclude that this result is a logical one.