Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoa nganh » hoc nganh, khoi nganh, hoa doanh
sach hoc » cach hoc, sach hoi, mach hoc
cua hang » cua dang, cua nhung, cua cong
hang hoa » hang khoa, thanh hoa, hang va
nhan dan » phan dau, gian dan, nhan tai
te sach » toc sach
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoc tap, nghien cua hang hoa nganh khoa ((hoc xa) or (hoc ma)) hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien cua hang hoa nganh khoa ((hoc xa) OR (hoc ma)) hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cua hang hoa nganh khoa ((hoc xa) or (hoc ma)) hoi va nhan dan*.