Perhaps you should try some spelling variations:
nhanh dong » hanh dong, nhanh chong, anh dong
nhan khong » nhan thong, nhanh chong, nganh khong
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
va thanh » gia thanh, ban thanh, va tinh
su mach » su sach
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: su mach hoc tap, nghien cuu mo hoc ((nhanh dong) or (nhan khong)) hoc ma hoi va thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu mo hoc ((nhanh dong) OR (nhan khong)) hoc ma hoi va thanh van.
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu mo hoc ((nhanh dong) or (nhan khong)) hoc ma hoi va thanh van*.