头

tou

head; top;

first, leader

dot (zhu) + dot (zhu) + person/big (da)

two dots on man's top means head

宀

mian

实

shi

real, true, solid;

fruit

house (mian) + head (tou)

a house filled to the head, the topmost part, with real riches, like fruit

买

mai

to buy, purchase

hook [symbol] + head (tou)

my head is hooked on buying and purchasing

卖

mai

to sell

10 [] + buy (mai)

what one buys, one wants to sell 10 times more expensive

读

du

to read, to study

word (yan) + sell (mai)

words are sold as ideas (the shape of 讠), which one can read and study in books

纟

si

续

xu

to continue/renew

thread (si) + sell (mai)

to continue to sell threads of silk