Perhaps you should try some spelling variations:
phan phoi » phan thi
thu cach » thuc cach, thu canh, tu cach
cach hoc » cach thuc, cach thoi, dich hoc
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
coc phan » co phan, hoc phan, cac phan
phoi hoc » hoi hoc, phoi thuoc, hoa hoc
va phan » van phan, va phat, va phap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu cach hoc tap, nghien cuu cong coc phan phoi hoc ma hoa ((va phan) or (ca nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu cach hoc tap, nghien cuu cong coc phan phoi hoc ma hoa ((va phan) OR (ca nhan)) van.
• Adding a wildcard symbol may retrieve word variants: thu cach hoc tap, nghien cuu cong coc phan phoi hoc ma hoa ((va phan) or (ca nhan)) van*.