d a o u

d đ / ao au âu – 2x3 = 6

âo is invalid.

	d	đ
a	dao dau	đao đau
â	dâu	đâu

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Words you should learn — 12

Ordered by how likely you will hear & say them.

where	đâu	Extremely common, bạn đi đâu?
bean, rarely nut	đậu	Extremely common in menus
strawberry/ mulberry	dâu	Very common, mostly used as strawberry instead of mulberry.
peach	đào	Common flavour at smoothie bars.
head, first, extremity	đầu	Very common
mark, sign, tone	dấu	Very common, especially talking about spelling & pronunciation
oil	dầu	Very common
pain	đau	Used in most words for aches and pains.
knife	dao	Common
a stroll around	dạo	Quite common, hãy đi dạo
island	đảo	Many islands around Viet Nam and the world.
fight, battle	đấu	Normal word but less commonly heard

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All words

Order:

• dao, đao,

• dau, đau,

• dâu, đâu

dao

dao	knife (clsf: con)
dáo	Glosbe
dào	full, abundant, rich, ample, bounteous
dảo	Glosbe
dão	/
dạo	to walk, stroll

đao

đao	Chinese sabre, doublet of dao
đáo	unique, original – độc đáo
đào	peach (and many derived fruit names)
đảo	island (clsf: hòn); to turn upside-down
đão	leader, official
đạo	from “way” (道): code of conduct, religion; province (historical & foreign placenames). Đạo Đức Kinh.

dau

Overall, it seems like ⟨au⟩ after ⟨d⟩ is broadly invalid.

dau	/
dáu	?
dàu	term, length (or not? Maybe only )
dảu	/
dãu	/
dạu	/

đau

đau	pain, sore, ache
đáu	Thi đáu – compete, competition. Trận đáu – match. Giải đáu – tournament. Chiến đáu – fight. Đau đáu – common in translations, not sure what it means. (Glosbe) Possibly it is a reduplication of đau as pain. Yes, it is on Wiktionary as restlessly, anxiously, worriedly. (Wiktionary)
đàu	Seems to exist primarily as a misspelling of đầu, occurring especially often in two-part words.
đảu	/
đãu	Mutation of đâu (where)? Glosbe
đạu	/

dâu

dâu	Mulberry (dâu ta, our mulberry) → strawberry (dâu tây, western mulberry). Strawberry is now more popular so most mentions of dâu probably refer to strawberry.
dấu	Mark, sign, diacritic (ký hiệu); tone (thanh điệu, thanh (âm thanh)).
dầu	Oil. Also, alternative pronunciation of dù & dẫu, although (mặc dù).
dẩu	Perhaps valid as a phonic variant of something else? Glosbe
dẫu	Variant pronunciation of dù/dầu in mặc dù (although).
dậu	Rooster? And a Chinese-origin given name.

đâu

đâu	Where. Part of the demonstrative series with đây, đấy, đó.
đấu	Battle, fight. Many derived terms (common: chiến đấu).
đầu	Head (also trốc). An end, extremity; First.
đẩu	Only in compound words. “Dipper” from 斗.
đẫu	/
đậu	Bean; nut. Many derived terms, including things that western food culture does not necessarily deem to be a bean or a nut.