Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh khoa » nganh hoa, nganh khong, doanh khoa
thanh phan » thanh pho, thanh san, thanh toan
hoc nganh » hoc nhanh
thanh van » thanh san, thanh toan, thanh nhan
sach hoc » cach hoc, sach hoi, mach hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
bo sach » co sach, hoc sach
hap ban » lap ban, hap dan, nhat ban
hoc xa » hoc ma
xa hap » xa hai

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

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