Though the Canaanites have chariots fitted with iron and though they are strong, you can drive them out

 Joshua 17:1-18

Now Zelophehad son of Hepher, the son of Gilead, the son of Makir, the son of Manasseh, had no sons but only daughters, whose names were Mahlah, Noah, Hoglah, Milkah and Tirzah. They went to Eleazar the priest, Joshua son of Nun, and the leaders and said, “The Lord commanded Moses to give us an inheritance among our relatives.” So Joshua gave them an inheritance along with the brothers of their father, according to the Lord’s command.

There were towns belonging to Ephraim lying among the towns of Manasseh, but the boundary of Manasseh was the northern side of the ravine and ended at the Mediterranean Sea. 

Yet the Manassites were not able to occupy these towns, for the Canaanites were determined to live in that region. However, when the Israelites grew stronger, they subjected the Canaanites to forced labor but did not drive them out completely.

The people of Joseph replied, “The hill country is not enough for us, and all the Canaanites who live in the plain have chariots fitted with iron, both those in Beth Shan and its settlements and those in the Valley of Jezreel.”

But Joshua said to the tribes of Joseph—to Ephraim and Manasseh— the forested hill country as well. Clear it, and its farthest limits will be yours; though the Canaanites have chariots fitted with iron and though they are strong, you can drive them out.”

These tribes were to have extended their territory by clearance and conquest. But the horses and chariots of the Canaanites holding the plains deterred them.

Why?

In the Bible sons and daughter has the same right to get the inheritance among relatives. So it is fair and righteousness.

People lost faith there were many reasons to explain. Ephraim and Manasseh have numerous people. They can conquer the plain area of Canaanite, but they afraid of their iron chariot. We rely on the Lord, not the horse and chariot.

This is the reason that the Israelites fail before the Canaanites for they did not listen to the word of the Lord.

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27:1 屬約瑟的兒子瑪拿西的各族，有瑪拿西的玄孫，瑪吉的曾孫，基列的孫子，希弗的兒子西羅非哈的女兒，名叫瑪拉、挪阿、曷拉、密迦、得撒。他們前來，

32:39 瑪拿西的兒子瑪吉，他的子孫往基列去，佔了那地，趕出那裡的亞摩利人。40摩西將基列賜給瑪拿西的兒子瑪吉，他子孫就住在那裡。

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How?

God's word is precise and can not be modified by anyone with any reason.