Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc nganh » hoc nhanh
phan dau » phan tu, hang dau
cuu phan » cuu phat, cuu nhan, uu phan
khoa hoc » hoa hoc
cong hoc » dong hoc, cong hoa, cong coc
cac cong » cua cong
thu sach » thuat sach, thuoc sach, thu hoach
hoc cuu » hoc huu, hoc cua, hoc cau
tu sach » su sach, te sach, tu cach
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) hoc tap, nghien cac cong hoc nganh khoa hoc xa hoc cuu phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) hoc tap, nghien cac cong hoc nganh khoa hoc xa hoc cuu phan dau".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) hoc tap, nghien cac cong hoc nganh khoa hoc xa hoc cuu phan dau*.