Mandarin glyph selection help

Even with the preference for monosyllabic roots I would expect the tone
system to give Mandarin fewer homonyms, but it seems like every time I
type some Pinyin, OS X presents me with a plethora of character choices.
So if someone could point me to the correct glyphs (Simplified is fine,
Unicode code points would be great) for the following, I'd appreciate it.

Huáng dì (as in the name of the Yellow Emperor)

        皇帝，荒地，幌地，黄帝?

jiǎ (one of the two Celestial Stems associated with the element Wood)

        I think this is 瘕

shēn (the Terrestrial Branch associated with the Ape totem)
        砷 or 蜃

yǐ (the second Celestial Stem associated with the element Wood).
yǒu (the Terrestrial Branch associated with the Rooster totem)

These two are the exceptions to the rule - I can't find *any* characters
for them.  Maybe I have the wrong tone information?

Anyway, any help appreciated.

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