Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
tu mach » tu manh, tu hach, tu sach
tu cach » tu cac
nhan va » nhan tai, nhan dan, nhan tao
mo hoc » mon hoc, co hoc
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu mach) OR (tu cach)) hoc tap, nghien cuu mo hoc doanh hoa hoc xa hoi ca nhan va~".
• Adding a wildcard symbol may retrieve word variants: ((tu mach) OR (tu cach)) hoc tap, nghien cuu mo hoc doanh hoa hoc xa hoi ca nhan va*.