The phrase 'ในแง่ที่ (nai ngâe thîi)' is used to indicate the perspective or direction from which something is being considered, similar to the English phrases 'in terms of' or 'from the aspect of'. It allows the speaker to specify the dimension along which they are viewing a situation or evaluating a subject. The phrase can be used before an adjective or noun phrase to provide context or scope for a statement or observation.