Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoi » sach moi, cach thoi, hoach hoi
sach doi » sach moi, sach dao, sach bai
van tuan » van quan, van ban, anh tuan
van hoc » van hoa
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) OR (sach doi)) dap, nghien cuu van hoc doanh hoa hoc xa hoi va van tuan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach hoi) OR (sach doi)) dap, nghien cuu van hoc doanh hoa hoc xa hoi va van tuan".
• Adding a wildcard symbol may retrieve word variants: su ((sach hoi) OR (sach doi)) dap, nghien cuu van hoc doanh hoa hoc xa hoi va van tuan*.