Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
dan nhan » danh nhan, dan chan, van nhan
van chat » cao chat
tu mach » tu cach, tu manh, tu hach
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 mach hoc tap, nghien cuu mo hoc nganh khoa hoc ma hoi ((dan nhan) or (van chat)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu mo hoc nganh khoa hoc ma hoi ((dan nhan) OR (van chat)) van.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu mo hoc nganh khoa hoc ma hoi ((dan nhan) or (van chat)) van*.