Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
von doanh » van doanh, voi doanh, toan doanh
thu sach » tu sach, thuat sach, thuoc sach
sach toi » sach doi, sach hoi, sach moi
khoa hoc » hoa hoc
phan van » pham van, thanh van, tran van
toi tap » toi gap, toan tap, tong tap
mot von » mot con, mot cong, mot dong
hoc xa » hoc ma
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach toi tap, nghien cua mot von doanh khoa hoc xa hoi va ((phan van) OR (luan van))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach toi tap, nghien cua mot von doanh khoa hoc xa hoi va ((phan van) OR (luan van))".
• Adding a wildcard symbol may retrieve word variants: thu sach toi tap, nghien cua mot von doanh khoa hoc xa hoi va ((phan van) OR (luan van))*.