Add spaces: -Internationalflightfrom/toVietnamandairporttax.

Answer: -International flight from/to Vietnam and airport tax.

Add spaces: Predispositiontothebirthoftwinshavefamilieswhohaveafamilythroughthefemalelinehavealreadybeensimilarcases.However,theyhavethischanceisnotverylarge.

Answer: Predisposition to the birth of twins have families who have a family through the female line have already been similar cases. However, they have this chance is not very large.

Add spaces: Eachofuscanthenimagineastorywheretheyoungmanmeetstheyoungwomanevenifthetwodancersdon'tfolloweachotherimmediatelyinthedance.

Answer:
Each of us can then imagine a story where the young man meets the young woman even if the two dancers don't follow each other immediately in the dance.