Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
chong hoc » chung hoc, chong doc, thong hoc
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
hoc phan » hoc dan, hoc pho
dan phan » doan phan, dan chan, van phan
phan van » pham van, thanh van, luan van
hoi dan » hoa dan, hoc dan, hoi dap
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: thu ((sach hoc) OR (sach hoi)) tap, nghien cuu mo hoc phan chong hoc xa hoi dan phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach hoc) OR (sach hoi)) tap, nghien cuu mo hoc phan chong hoc xa hoi dan phan van".
• Adding a wildcard symbol may retrieve word variants: thu ((sach hoc) OR (sach hoi)) tap, nghien cuu mo hoc phan chong hoc xa hoi dan phan van*.