Perhaps you should try some spelling variations:
cong hoan » cong hoa, dong hoa, cong ha
manh hoc » anh hoc, manh ho, manh hon
cong san » cong tac
cong hoc » dong hoc, cong hoa, cong coc
vu manh » vu minh, vu anh, tu manh
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
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: vu manh hoc tap, nghien cuu ((cong hoan) OR (cong san)) thanh cong hoc ma hoi va nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu manh hoc tap, nghien cuu ((cong hoan) OR (cong san)) thanh cong hoc ma hoi va nhan va".
• Adding a wildcard symbol may retrieve word variants: vu manh hoc tap, nghien cuu ((cong hoan) OR (cong san)) thanh cong hoc ma hoi va nhan va*.