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Merge pull request #1 from PhucPM/phucpm

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Merge pull request #2 from PhucPM/DaoLV

DaoLV commit xin chao
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Merge pull request #3 from PhucPM/DaoLV

Dao lv
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Merge pull request #4 from PhucPM/phucpm

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update helper
Merge pull request #5 from PhucPM/phucpm

update helper
update helper
Merge pull request #6 from PhucPM/phucpm

update helper
update helper
Merge pull request #7 from PhucPM/phucpm

update helper
19-11