Perhaps you should try some spelling variations:
khoa dang » khoa dung, hoa dong, khoa cong
chuc nhan » thuc nhan, chuc nganh, chung nhan
hach hoc » cach hoc, mach hoc, hoach hoi
cuu toan » cuu hoan, cua toan, huu toan
khoa hoc » hoa hoc
tu hach » tu hanh, tu cach, tu 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 hach hoc tap, nghien cuu toan ((khoa dang) or (hoa dan)) khoa hoc xa hoi chuc nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hach hoc tap, nghien cuu toan ((khoa dang) OR (hoa dan)) khoa hoc xa hoi chuc nhan va.
• Adding a wildcard symbol may retrieve word variants: tu hach hoc tap, nghien cuu toan ((khoa dang) or (hoa dan)) khoa hoc xa hoi chuc nhan va*.