Perhaps you should try some spelling variations:
nganh khong » nhanh chong, nganh nong, nganh khoa
nganh cong » nhanh chong, thanh cong
benh hoc » sinh hoc
gian dan » gian lang
tu benh » tru benh, thu benh, tuy benh
va gian » va gianh, van gian, va giai
mo hoc » mon hoc, co hoc
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 benh hoc tap, nghien cuu mo hoc ((nganh khong) OR (nganh cong)) hoc ma hoi va gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu benh hoc tap, nghien cuu mo hoc ((nganh khong) OR (nganh cong)) hoc ma hoi va gian dan".
• Adding a wildcard symbol may retrieve word variants: tu benh hoc tap, nghien cuu mo hoc ((nganh khong) OR (nganh cong)) hoc ma hoi va gian dan*.