どんなに~ても・いくら~ても
No matter how much or how strongly
You’ll be able to say that a result does not change, regardless of degree, amount, or effort.

どんなに忙しくても、朝ご飯はしっかり食べます。
donna ni isogashikute mo, asagohan wa shikkari tabemasu.
What do you think this sentence means?
No matter how busy I am, I make sure to eat a proper breakfast.
No matter how much or how far
どんなに~ても and いくら~ても mean “no matter how....” They emphasize that the main result remains unchanged even at an extreme degree.
いくら呼んでも、猫は来ません。
ikura yonde mo, neko wa kimasen.
No matter how many times I call, the cat will not come.
どんなに高くても、このカメラがほしいです。
donna ni takakute mo, kono kamera ga hoshii desu.
No matter how expensive it is, I want this camera.
Use the て-form plus も
Both go before a predicate in て-form + も. Use どんなに especially for degree, such as how busy something is or how strongly an action is done; use いくら especially for amount, degree, or repeated actions.
いくら練習しても、すぐには上手になりません。
ikura renshuu shite mo, sugu ni wa jouzu ni narimasen.
No matter how much you practice, you will not become good at it right away.
いくら探しても、家の鍵が見つからない。
ikura sagashite mo, ie no kagi ga mitsukaranai.
No matter how much I search, I can’t find my house key.
どんなに疲れていても、寝る前に歯をみがきます。
donna ni tsukarete ite mo, neru mae ni ha o migakimasu.
No matter how tired I am, I brush my teeth before bed.
いくら安くても、使わない物は買わないことにしている。
ikura yasukute mo, tsukawanai mono wa kawanai koto ni shite iru.
No matter how cheap something is, I make a point of not buying things I won’t use.
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