Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoa nganh » khoi nganh, hoa doanh, hoa thanh
hoc nganh » hoc nhanh
chau nhan » chan nhan, chau phan, ca nhan
sach hoc » cach hoc, sach hoi, mach hoc
cac cong » cua cong
khoa hoc » hoa hoc
hoi chau » hoi chu, hoi cham, hai chau
tu sach » thu sach, su sach, te sach
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma

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 hoc tap, nghien cac cong ((hoa nganh) OR (hoc nganh)) khoa hoc xa hoi chau nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cac cong ((hoa nganh) OR (hoc nganh)) khoa hoc xa hoi chau nhan va".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cac cong ((hoa nganh) OR (hoc nganh)) khoa hoc xa hoi chau nhan va*.