Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoi » sach moi, cach thoi, hoach hoi
sach doi » sach moi, sach dao, sach bai
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan tai » hang tai, van tai, toan tai
hai van » thai van, ha van, hai tan
mo hoc » mon hoc, co hoc
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.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach hoi) OR (sach doi)) tap, nghien cuu mo hoc doanh khoa hoc xa hai van nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach hoi) OR (sach doi)) tap, nghien cuu mo hoc doanh khoa hoc xa hai van nhan tai".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach hoi) OR (sach doi)) tap, nghien cuu mo hoc doanh khoa hoc xa hai van nhan tai*.