Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
bang khoa » hang khoa, dang khoa, vang khoa
hach hoc » cach hoc, mach hoc, hoach hoi
hoc bang » hoc bong, hoc tang, hoc dan
khoa hoc » hoa hoc
tu hach » tu hanh, tu cach, tu sach
va nhan » van nhan, va phan, va nha
cua co » cua bo, cua cong
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 hach hoc tap, nghien cua co hoc bang khoa hoc xa hoi ((va nhan) OR (ca nhan)) va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu hach hoc tap, nghien cua co hoc bang khoa hoc xa hoi ((va nhan) OR (ca nhan)) va".
• Adding a wildcard symbol may retrieve word variants: tu hach hoc tap, nghien cua co hoc bang khoa hoc xa hoi ((va nhan) OR (ca nhan)) va*.