Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh khoa » nganh hoa, nganh khong, doanh khoa
coc nganh » hoc nganh, cac nganh, chuc nganh
van phong » van dong, hai phong
phong dau » phong dieu, hang dau, phan dau
sach hoc » cach hoc, sach hoi, mach hoc
cong coc » cong cuoc, cong cac, cong co
khoa hoc » hoa hoc
cao thai » cao tai, ca thai, cao khai
so sach » so sanh, bo sach, co sach
cao thi » cau thi, cao tai, dao thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nghien thu cong coc nganh khoa hoc ((cao thai) OR (cao thi)) van phong dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien thu cong coc nganh khoa hoc ((cao thai) OR (cao thi)) van phong dau".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien thu cong coc nganh khoa hoc ((cao thai) OR (cao thi)) van phong dau*.