Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
vu sach » vu bach, su sach, vu khach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, ha van, hai tan
nhan va » nhan dan, nhan tao, phan van
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: vu sach hoc tap, nghien cuu mot hoc doanh khoa hoc xa hai van ((nhan va) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hoc tap, nghien cuu mot hoc doanh khoa hoc xa hai van ((nhan va) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: vu sach hoc tap, nghien cuu mot hoc doanh khoa hoc xa hai van ((nhan va) or (nhan tai))*.