Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
doanh hoan » doanh doanh, doanh khoa, doanh nhan
sach hoi » sach doi, sach moi, cach thoi
toan hoa » toan khoa, toan hoat, toan ho
toan hoc » toan khoa, van hoc, hoa hoc
hoan hoc » hoa hoc, hoang hoa, khoan hoi
van tuan » van quan, van ban, anh tuan
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
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: su sach hoi tap, nghien huu ((toan hoa) OR (toan hoc)) doanh hoan hoc xa hoi va van tuan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tap, nghien huu ((toan hoa) OR (toan hoc)) doanh hoan hoc xa hoi va van tuan".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien huu ((toan hoa) OR (toan hoc)) doanh hoan hoc xa hoi va van tuan*.