Perhaps you should try some spelling variations:
manh ngoai » minh ngoai, doanh ngoai, ban ngoai
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
ngoai tap » ngoai tac, ngoai tai, ngoai tru
cong hoc » dong hoc, cong hoa, cong coc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
tu manh » tu minh, tu hanh, vu manh
hoi dan » hoa dan, hoi dap, thoi dai
hoc xa » hoc ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu manh ngoai tap, nghien thu cong hoc dan khoa hoc xa hoi dan ((nhan dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu manh ngoai tap, nghien thu cong hoc dan khoa hoc xa hoi dan ((nhan dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: tu manh ngoai tap, nghien thu cong hoc dan khoa hoc xa hoi dan ((nhan dan) or (nhan tai))*.