Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
sanh hoc » sinh hoc, anh hoc, danh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
hoc phan » hoc dan, hoc pho
bai hang » ban hang, bai tang, dai hang
hang san » hoang san, hang ban, hanh san
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 dong hoc phan chong ((hoc xa) or (hoc ma)) hoi bai hang san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh hoc tap, nghien cuu dong hoc phan chong ((hoc xa) OR (hoc ma)) hoi bai hang san.
• Adding a wildcard symbol may retrieve word variants: so sanh hoc tap, nghien cuu dong hoc phan chong ((hoc xa) or (hoc ma)) hoi bai hang san*.