Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
bai thanh » ban thanh, tai thanh, mai thanh
sanh hoc » sinh hoc, anh hoc, danh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoc phan » hoc dan, hoc pho
so sanh » do sanh
hoi bai » hoc bai, hoi tai, khoi bay

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh hoc tap, nghien cuu cong hoc phan chong ((hoc xa) or (hoc ma)) hoi bai thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh hoc tap, nghien cuu cong hoc phan chong ((hoc xa) OR (hoc ma)) hoi bai thanh san.
• Adding a wildcard symbol may retrieve word variants: so sanh hoc tap, nghien cuu cong hoc phan chong ((hoc xa) or (hoc ma)) hoi bai thanh san*.