Perhaps you should try some spelling variations:
doanh khoa » toan khoa
ngoai tap » ngoai tai, ngoai tru, ngoai ma
ngoai tac » ngoai tai, ngoai tru
cuu cong » cua cong, thu cong, cac cong
cu doanh » cua doanh, cu danh, su doanh
khoa hoc » hoa hoc
cua nhan » ca nhan, cua ngan, cua nha
nhan dan » phan dau, gian dan, nhan tai
tu nang » tru nang, tu nong, tu nano
cong cu » chung cu
hoi cua » hoi chuc
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 nang ((ngoai tap) or (ngoai tac)), nghien cuu cong cu doanh khoa hoc ma hoi cua nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu nang ((ngoai tap) OR (ngoai tac)), nghien cuu cong cu doanh khoa hoc ma hoi cua nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu nang ((ngoai tap) or (ngoai tac)), nghien cuu cong cu doanh khoa hoc ma hoi cua nhan dan*.