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

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 dong khoi nganh khoa ((hoc xa) OR (hoc ma)) hoi van nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cua dong khoi nganh khoa ((hoc xa) OR (hoc ma)) hoi van nhan dan".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cua dong khoi nganh khoa ((hoc xa) OR (hoc ma)) hoi van nhan dan*.