I suppose DL want a more exact translation. Your sentence would be Níl aon sciortaí romhainn.
A good explanation of the sounds in Irish are given in chapter one of Graiméar Gaeilge na mBráithre Críostaí
The sound of mh varies depending on whether:
- it affects the preceding vowel
- it combines with the preceding vowel to form a diphthong
- it is sounded as a consonant
Affecting the preceding vowel:
Sometimes in the combination omh or omha the effect of mh is to lengthen the vowel 'o' making the whole combination sound like ó. Examples are: chomh, comharsa, comhla, romham, tomhas, comhairle, romhainn, thomhais.
Similarly with the combination umh or umha. Examples are : ciumhais, cumhacht, cumhra, Mumhain, umhal. These sound like ciúis, cúcht, cúra, Múin, úl respectively.
Combining with the preceding vowel:
In a multi-syllable word but not ending in mh, if mh or mha is preceded by the vowel 'a' it combines with it to form an 'au' sound. Examples are: amhras, gamhain, macasamhail, ramhar, cleamhnas, sleamhain, Teamhair, namhaid. This is where you get the impression that mh sounds a bit like a 'w'.
Sounded as a consonant:
Here mh has a 'v' sound. Examples are: neamh, talamh, gaineamh, amh, grámhar, amháin, nimh, ríomh, riamh, mheáigh, deimhin, naimhde.
Also it varies with dialect. For example, where I grew up mh in grámhar and amháin was sounded like a 'w'. In deimhin and naimhde the mh was silent.
I don't think it applies to 'bh'.
'bh', 'dh' and 'gh' are covered in chapter 1 of the link I posted.
I have to back up a level to reply to your question about 'bh'.
bh combines with the preceding vowel 'a' in the same way as 'mh' to form an 'au' sound. Examples are: cabhair, fabhra, gabhar, labhair, leabhar, Cabhán, cabhlach, fabhair, tabhair, abhaill, creabhair, meabhair.
Similarly bh combines with the vowel 'o' to form an 'ou' sound, for example cobhsaí, tobhach.
bh sounded as a consonant has a 'v' sound like mh. Examples are: bhain, bhrúigh, tarbh, brobh, ubh, scríobh, bhí, luibh, deilbh.
In the word faobhar only the 'ao' sound is made; the bh is silent.