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
cac nhan » ca nhan, cac nha, dac nhan
cam nhan » ca nhan, cam chan, cam nang
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 ((cac nhan) OR (cam nhan)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cua cong hoc nganh khoa hoc ma hoi ((cac nhan) OR (cam nhan)) van".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cua cong hoc nganh khoa hoc ma hoi ((cac nhan) OR (cam nhan)) van*.