Merge pull request #100 from nguyenxuanluong-luvina/master

Fix bug #508
Fix bug #478
Merge pull request #101 from maixuanthanh-luvina/master

Fix bug #478
Update source fix bug issue 511
Merge pull request #102 from maixuanthanh-luvina/master

Update source fix bug issue 511
Remove collections is not necessary in tree menu
Merge pull request #103 from maixuanthanh-luvina/master

#516 Remove collections is not necessary in tree menu
Update source fix issue 515
Merge pull request #104 from maixuanthanh-luvina/master

Update source fix issue 515