Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
van quan » van ban
quan van » luan van, quan va, quan luan
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu tong
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien ((cuu mon) OR (cuu cong)) hoc doanh hoa hoc xa hai van quan van~.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien ((cuu mon) or (cuu cong)) hoc doanh hoa hoc xa hai van quan van*.