This is good question.
Agree with what've been said by Pachara Wattana , born and raised in Bangkok, Thailand. I speak up as a person born and raised in Saigon, Vietnam ;)
Vietnamese has similar opinion as Thai does. Things mentioned by Pachara about how Thai thinks about Vietnam are coincidently things Vietnamese thinks about Thai. We - Thai and Vietnamese - think same about each other. That gives Vietnamese (I think Thai, too, because Pachara also mentioned) a sense of sound competition to upgrade our country - towards a bright future. Why? Because Vietnamese always sees Thai as further developed than Vietnam in almost life aspects: economy in general (industry + agriculture); tourism; public health; lifestyle; every thing… And why, Vietnamese talks about, thinks about Thai as a mirror for comparison? Why does Vietnamese takes Thai, but not Indonesian or Malaysian or Campodian,… Because Thai and Vietnamese are countries with very similar conditions, culture, people,… and because Vietnamese love Thai and trust Thai. In Vietnamese culture, if we don't like some things or if we don't hate a country, we will use name of that country negatively for comparison (e.g. talking about bad habit,…). Even though Vietnam lives next to Laos and Cambodia and China, but we think that the level of development of Thai and Vietnam can be considered same (Vietnam + 10–20 years later = Thailand at the present). By that way, we think that electing Thailand is good and feasible for Vietnam to look about good and model future.
Same in sport, music, and international integration. Thai also causes lots of ink and paper in Vietnam. We can see it clearly in football. Vietnamese newspaper gives their opinion on how to catch up with development of Thai football, etc…
To sum up, Vietnamese thinks good about Thai people. Vietnamese thinks Thai as a model for development even though Vietnamese also takes into account samples from other Asian countries. The origin of those comes from the real situation of Vietnam. Vietnam integrates later into international community. So, we think that, it can take us less time by utilizing lesson learnt from other countries like Thailand. We also have good relationship with Thai government. We can be considered have the best relationship of all time.