just type lv, you can get lu with the two dots on top

try virtual keyboard which is available on translate google website

1. If you wanted/intended to type the Pinyin, not the characters, I recommend you use Google Pinyin IME. https://en.wikipedia.org/wiki/Google_Pinyin Or http://www.google.com/intl/zh-CN/ime/pinyin/ There is a soft keyboard or virtual keyboard on the IME, you can type all the Pinyin alphabets, of course including ǖǘǚǜü. 2. If you only want to type the characters, for example 旅行社lv xing she、旅馆lv guan, we normally use 'v' to substitute 'ü'. Because there is not 'ü ' in the keyboard.

If you want to type pinyin: On (most?) phones: Hold down the "u" button. It'll give you other options including "ü" On the computer: Hold alt and type (I think) 129.

You also can use v instead of ü 旅行 pronounce as lvxing