Perhaps you should try some spelling variations:
doanh khoa » toan khoa
ngoai tap » ngoai tac, ngoai tru, ngoai ma
ngoai tai » ngoai tac, ngoai tru, ngoai hoi
cuu cong » cua cong, thu cong, cac cong
su doanh » so doanh, cua doanh, san doanh
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
tu nang » tru nang, tu nong, tu nano
cong su » cong suc, cong sua, cong cu
ma hoi » mai hoi, xa hoi, ma hoa
hoi ca » hoi cua, hoi cac, hoi cau

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 tai)), nghien cuu cong su doanh khoa hoc ma hoi ca nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu nang ((ngoai tap) OR (ngoai tai)), nghien cuu cong su doanh khoa hoc ma hoi ca nhan van".
• Adding a wildcard symbol may retrieve word variants: tu nang ((ngoai tap) OR (ngoai tai)), nghien cuu cong su doanh khoa hoc ma hoi ca nhan van*.