Perhaps you should try some spelling variations:
khang khoa » hang khoa, khang kho, khong khoa
khoa nganh » khoi nganh, hoc nganh
cuu khang » huu khang, cuu nang, cuu thanh
nganh hoa » thanh hoa, khanh hoa, danh hoa
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » cach hoc, sach hoi, mach hoc
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan
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 cuu khang khoa nganh hoa hoc xa hoi ((va nhan) or (danh nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu khang khoa nganh hoa hoc xa hoi ((va nhan) OR (danh nhan)) van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu khang khoa nganh hoa hoc xa hoi ((va nhan) or (danh nhan)) van*.