Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
chong hoc » chung hoc, chong doc, thong hoc
cach hoc » cach thuc, cach thoi, dich hoc
sach hoi » sach doi, sach moi, cach thoi
hoc phan » hoc dan, hoc pho
phat van » pham van, phan van, phap van
mo hoc » mon hoc, co hoc
hoc xa » hoc ma

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) or (sach hoi)) tap, nghien cuu mo hoc phan chong hoc xa hoi va phat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach hoc) OR (sach hoi)) tap, nghien cuu mo hoc phan chong hoc xa hoi va phat van.
• Adding a wildcard symbol may retrieve word variants: tu ((cach hoc) or (sach hoi)) tap, nghien cuu mo hoc phan chong hoc xa hoi va phat van*.