Perhaps you should try some spelling variations:
coc doanh » cac doanh, hoa doanh, cho doanh
doanh hoa » doanh khoa, doanh hoan, danh hoa
hut tinh » hut binh, huu tinh, huy tinh
tinh hoc » sinh hoc, tin hoc, hinh hoc
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
nhan tao » nhan tai, nhan dan
hoi dan » hoa dan, hoc dan, hoi dap
nhan va » nhan tai, nhan dan, phan van
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: hut tinh hoc tap, nghien cuu cong coc doanh hoa hoc ma hoi dan ((nhan va) OR (nhan tao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hut tinh hoc tap, nghien cuu cong coc doanh hoa hoc ma hoi dan ((nhan va) OR (nhan tao))".
• Adding a wildcard symbol may retrieve word variants: hut tinh hoc tap, nghien cuu cong coc doanh hoa hoc ma hoi dan ((nhan va) OR (nhan tao))*.