Perhaps you should try some spelling variations:
doanh khoa » toan khoa
nam tinh » nam dinh, nam linh, cam tinh
lam tinh » may tinh, ha tinh, ban tinh
cuu tong » cuu cong, cuu tinh, huu tung
so doanh » so danh, su doanh, hoa doanh
khoa hoc » hoa hoc
tong so » tuong so, thong so, tong son
va luan » vay luan, van luan, va quan
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nam tinh) OR (lam tinh)) hoc tap, nghien cuu tong so doanh khoa hoc ma hoi va luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nam tinh) OR (lam tinh)) hoc tap, nghien cuu tong so doanh khoa hoc ma hoi va luan van".
• Adding a wildcard symbol may retrieve word variants: ((nam tinh) OR (lam tinh)) hoc tap, nghien cuu tong so doanh khoa hoc ma hoi va luan van*.