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INTERMEDIATE LEVEL
Content
several hours ☊ 
vài giờ ☊
several hours ☊ vài tiếng ☊
several hours ☊ vài tiếng đồng hồ ☊
→ → →
like: several hours → →
It was several hours before the road was cleared after the accident. ☊ clear ☊
The agreement came after several hours of negotiations. ☊ come ☊
It was not unknown for people to have to wait several hours (= it happened sometimes). ☊ unknown ☊
The water (= the supply of water) was turned off for several hours each day during the drought. ☊ water ☊