Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoa nganh » hoc nganh, khoi nganh, hoa doanh
mach hoc » cach hoc, dich hoc, anh hoc
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
tu mach » tu cach, tu manh, tu hach
va nhan » ca nhan, va phan, va nha
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 mach hoc tap, nghien cua cong hoa nganh khoa hoc xa hoi ((va nhan) OR (van nhan)) dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cua cong hoa nganh khoa hoc xa hoi ((va nhan) OR (van nhan)) dan".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cua cong hoa nganh khoa hoc xa hoi ((va nhan) OR (van nhan)) dan*.