Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
manh tuong » manh tung, manh cuong, minh tuong
cach hoc » cach thuc, cach thoi, dich hoc
cong hoc » dong hoc, cong hoa, cong ho
cong coc » cong cuoc, cong cac, cong co
tuong co » truong co, tuong ho, duong co
cac nhan » ca nhan, cac nha, cam nhan
nhan dan » phan dau, gian dan, nhan tai
tu cach » tu cac
hoi cac » hoc cac, voi cac, hoa cac
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 cach hoc tap, nghien thu ((cong hoc) or (cong coc)) manh tuong co ma hoi cac nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach hoc tap, nghien thu ((cong hoc) OR (cong coc)) manh tuong co ma hoi cac nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu cach hoc tap, nghien thu ((cong hoc) or (cong coc)) manh tuong co ma hoi cac nhan dan*.