Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, ha van, hai tan
nhan va » nhan tai, nhan dan, nhan tao
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: ((toc sach) or (thu sach)) hoc tap, nghien cua mot hoc doanh khoa hoc xa hai van nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) hoc tap, nghien cua mot hoc doanh khoa hoc xa hai van nhan va.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) hoc tap, nghien cua mot hoc doanh khoa hoc xa hai van nhan va*.