咫尺天涯

zi2 cek3 tin1 ngaai4

to see little of each other though living nearby

學海無涯

hok6 hoi2 mou4 ngaai4

no limits to what one still has to learn (lit., "sea of learning, no horizon")

天涯何處無芳草

tin1 ngaai4 ho4 cyu3 mou4 fong1 cou2

there are tons of potential mates in the world; there are plenty of fish in the

無涯

mou4 ngaai4

without limits; no bounds

涯際

ngaai4 zai3

boundary; edge

生涯

sang1 ngaai4

career

天涯海角

tin1 ngaai4 hoi2 gok3

the ends of the earth; the remotest corners of the earth