Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
toc doanh » toan doanh, tri doanh, hoa doanh
thu sach » thuat sach, thuoc sach, thu hoach
khoa hoc » hoa hoc
tu sach » su sach, te sach, tu cach
moi tap » moi tai, toi tap
cua dan » cua dang, cua ban, ca dan
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
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: ((tu sach) OR (thu sach)) moi tap, nghien cua dan toc doanh khoa hoc xa hoi va nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) moi tap, nghien cua dan toc doanh khoa hoc xa hoi va nhan va".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) moi tap, nghien cua dan toc doanh khoa hoc xa hoi va nhan va*.