Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nhan khoa » nha khoa, khuan khoa, toan khoa
thoi dai » hoc dai, hoi dap
cong coc » cong cuoc, cong cac, cong co
coc nhan » cac nhan, goc nhan, hoc nhan
khoa hoc » hoa hoc
hoi dan » hoa dan, hoc dan, hoi dap
van tai » von tai, van tuan
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: tu cac ((thoi dai) or (hoi dan)), nghien cua cong coc nhan khoa hoc ma hoi va van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((thoi dai) OR (hoi dan)), nghien cua cong coc nhan khoa hoc ma hoi va van tai.
• Adding a wildcard symbol may retrieve word variants: tu cac ((thoi dai) or (hoi dan)), nghien cua cong coc nhan khoa hoc ma hoi va van tai*.