Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
cam chan » cam nhan, dan chan
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu mach hoc tap, nghien cua cong hoc nganh khoa hoc ma hoi ((cam nang) or (cam chan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, nghien cua cong hoc nganh khoa hoc ma hoi ((cam nang) OR (cam chan)) van.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cua cong hoc nganh khoa hoc ma hoi ((cam nang) or (cam chan)) van*.