Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc nganh » hoc nhanh
manh hoc » anh hoc, manh ho, manh hon
cong hoc » dong hoc, cong hoa, cong coc
mai khoi » mai khoa, tai khoa, cac khoi
nhan van » nhan dan, nhan va, phan van
tu manh » tu minh, tu hanh, vu manh
mai hoi » dai hoi, lai hoi, mai doi
va nhan » van nhan, ca nhan, va phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu manh hoc tap, nghien thu cong hoc nganh cong thuoc ((mai hoi) OR (mai khoi)) va nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu manh hoc tap, nghien thu cong hoc nganh cong thuoc ((mai hoi) OR (mai khoi)) va nhan van".
• Adding a wildcard symbol may retrieve word variants: tu manh hoc tap, nghien thu cong hoc nganh cong thuoc ((mai hoi) OR (mai khoi)) va nhan van*.