https://www.academia.edu/36819872/Ho%C3%A1_Sinh_II_-_%C4%90%E1%BA%B7ng_Minh_Nh%E1%BA%ADt_-_%C4%90%E1%BA%A1i_h%E1%BB%8Dc_%C4%90%C3%A0_N%E1%BA%B5ng_2008
hoa duoc pham ngoc thach
https://www.academia.edu/36819872/Ho%C3%A1_Sinh_II_-_%C4%90%E1%BA%B7ng_Minh_Nh%E1%BA%ADt_-_%C4%90%E1%BA%A1i_h%E1%BB%8Dc_%C4%90%C3%A0_N%E1%BA%B5ng_2008
https://www.academia.edu/36788342/B%C3%A0i_gi%E1%BA%A3ng_Ho%C3%A1_h%E1%BB%AFu
hoa huu co dai hoc nong lam
_c%C6%A1_-_Phan_Th%E1%BB%8B_Di%E1%BB%87u_Huy%E1%BB%81n_-_Tr%C6%B0%E1%BB%9Dng_%C4%90%E1%BA%A1i_h%E1%BB%8Dc_N%C3%B4ng_L%C3%A2m_Hu%E1%BA%BF_2009
hoa huu co 1dhspham
https://www.academia.edu/36776439/B%C3%A0i_gi%E1%BA%A3ng_Ho%C3%A1_h%E1%BB%AFu_c%C6%A1_1_-_%C4%90%E1%BB%97_Th%E1%BB%8B_Thu%C3%BD_V%C3%A2n_-_Tr%C6%B0%E1%BB%9Dng_%C4%90H_S%C6%B0_ph%E1%BA%A1m_%C4%90%C3%A0_N%E1%BA%B5ng_2012
hoa  vo co
https://www.academia.edu/36773064/B%C3%A0i_gi%E1%BA%A3ng_Ho%C3%A1_v%C3%B4_c%C6%A1_-_Ng%C3%B4_th%E1%BB%8B_M%E1%BB%B9_B%C3%ACnh_-_Tr%C6%B0%E1%BB%9Dng_%C4%90%E1%BA%A1i_h%E1%BB%8Dc_S%C6%B0_ph%E1%BA%A1m_%C4%90%C3%A0_N%E1%BA%B5ng_2007
tieng anh le dung
https://vi.scribd.com/doc/266114377/Ng%E1%BB%AF-Phap-Ti%E1%BA%BFng-ANh-Nang-Cao-Le-D%C5%A9ng