-(으)려고 하다 expresses the subject's intention or plan that has yet to be acted upon. It means 'plan to' or 'intend to' in English. When the verb stem ends in a vowel or ㄹ, -려고 하다 is used, and when the stem ends in a consonant, -으려고 하다 is used. Moreover, while -(으)려고 했다 is the past tense form of -(으)려고 하다, it is used when the intended action or plan did not materialize as expected.

Kimchi Reader

Express an intention, desire or purpose to do something. The speaker expresses one's intention to do the act mentioned in the preceding statement.