Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
von doanh » van doanh, toan doanh, hoa doanh
voi doanh » tri doanh, hoa doanh, van 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, luan van
toi tap » toi gap, toan tap, tong tap
va phan » van phan, va phat, va phap
hoc xa » hoc ma

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