If a couple has failed to achieve fertilization with AI (Artificial Insemination) technique, there are several advanced techniques that can be considered. These techniques include ZIFT (Zygote Intrafallopian Transfer), GIFT (Gamete Intrafallopian Transfer), ICSI (Intracytoplasmic Sperm Injection), and IUT (Intrauterine Transfer).

1) ZIFT (Zygote Intrafallopian Transfer):
ZIFT is a technique that involves the fertilization of eggs in the laboratory through IVF (In Vitro Fertilization), followed by the transfer of the resulting zygotes into the fallopian tubes. This procedure allows the zygotes to travel naturally into the uterus for implantation. ZIFT can be considered if the couple's fallopian tubes are healthy and functioning properly.

2) GIFT (Gamete Intrafallopian Transfer):
GIFT is a procedure where both eggs and sperm are transferred into the fallopian tubes, allowing fertilization to occur naturally within the woman's body. This technique is suitable for couples with unexplained infertility or mild male factor infertility. GIFT requires at least one healthy and open fallopian tube.

3) ICSI (Intracytoplasmic Sperm Injection):
ICSI is an advanced technique used in cases where the male partner has severe infertility issues, such as low sperm count or poor sperm quality. It involves the direct injection of a single sperm into the cytoplasm of an egg using a specialized microneedle. This technique bypasses the need for the sperm to naturally penetrate the egg and can significantly increase the chances of fertilization.

4) IUT (Intrauterine Transfer):
IUT is a technique that involves the transfer of an already fertilized embryo directly into the uterus. This can be an option for couples who have experienced previous failed attempts at IVF or other assisted reproductive techniques. It allows the embryo to bypass potential issues with implantation in the fallopian tubes.

In conclusion, if a couple has failed to achieve fertilization with AI technique, there are several advanced techniques that can be considered. These include ZIFT, GIFT, ICSI, and IUT. The choice of technique will depend on various factors such as the couple's specific infertility issues, the condition of the fallopian tubes, and the quality of the sperm and eggs. It is important to consult with a fertility specialist to determine the most suitable advanced technique for the couple's individual circumstances.