Perhaps you should try some spelling variations:
nghien huy » nghien cuu, nguyen huy, nghiep quy
doanh khoa » toan khoa
goc doanh » hoa doanh, voi doanh, von doanh
nhan dann » nhan dang, phan dang, nhac dan
hinh hoc » sinh hoc, tin hoc, benh hoc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
tu hinh » tu minh, tu hanh, su hinh
hoc tai » hoc dai, hoc tap, hoc bai
huy mot » huu mot, chua mot, huoc mot
hoa va » hoa van, hoa xa, hoa vo

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu hinh hoc tai, nghien huy mot goc doanh khoa hoc ma hoa va ((nhan dann) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hinh hoc tai, nghien huy mot goc doanh khoa hoc ma hoa va ((nhan dann) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: tu hinh hoc tai, nghien huy mot goc doanh khoa hoc ma hoa va ((nhan dann) or (nhan dan))*.