Perhaps you should try some spelling variations:
nganh khong » nganh cong, nganh nong, nganh khoa
nhanh chong » thanh cong, khanh phong
gianh dan » gian dan, giang day, giang van
benh hoc » sinh hoc
va gianh » va gian, van giang, va giai
tu benh » tru benh, thu benh, tuy benh
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 (nhanh chong)) hoc ma hoi va gianh dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu benh hoc tap, nghien cuu mo hoc ((nganh khong) OR (nhanh chong)) hoc ma hoi va gianh dan.
• Adding a wildcard symbol may retrieve word variants: tu benh hoc tap, nghien cuu mo hoc ((nganh khong) or (nhanh chong)) hoc ma hoi va gianh dan*.