Yellow-eyeringed bird

What is that warbler with a grey cap and white eyerings in Vietnam?

1/ Alström's warbler
- Bright eyerings;
- Grey cap and nape with two black stripes on the two sides;
- Olive-green with yellow tone face;
- Olive green back with dark grey at the wing tips;
- Yellow underparts;
- No wingbars.

2/ Martens's warbler

3/ Gray-crowned warbler
- Not quite bright eyerings;
- A thin break at the rear of the eyering.

4/ White-speckled warbler
- Bright eyerings;
- Some have a grey face;
- Mostly olive green back;
- One wing bar.

5/ Bianchi's warbler
- Bright eyerings;
- One wing bar.

6/ Grey-cheeked warbler
- Eyering has a wide break on the upper side;
- Grey throated;
- Head head.