Chapter 36: The Flaw in the Plan

Simplified Chinese (Mandarin: China)
百密一疏 Bǎimì yīshū	百密一疏 bǎimì yīshū = 'one hundred sealed, one omission'. Traditional expression describing one oversight that ruins a well-thought out plan.	One oversight in a well-thought out plan
Traditional Chinese (Mandarin: Taiwan)
百密一疏 Bǎimì yīshū	百密一疏 bǎimì yīshū = 'one hundred sealed, one omission'. Traditional expression describing one oversight that ruins a well-thought out plan.	One oversight in a well-thought out plan
Japanese
誤算 Gosan	誤算 gosan = 'miscalculation'.	Miscalculation
Vietnamese (Chinese characters show etymology)
Sơ hở trong kế hoạch	Sơ hở = 'hole'. trong = 'in'. kế hoạch (計畫) = 'plan'.	The hole in the plan

The two Chinese translators both hit on the same translation.

(Detailed notes on the chapter can be found at Harry Potter Lexicon)