Perhaps you should try some spelling variations:
phan chong » phan hong, phap chong, phan chung
phan cong » thanh cong
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
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 tap, nghien cuu mo hoc ((phan chong) OR (phan cong)) hoc xa hoi dan phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoc tap, nghien cuu mo hoc ((phan chong) OR (phan cong)) hoc xa hoi dan phan van".
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu mo hoc ((phan chong) OR (phan cong)) hoc xa hoi dan phan van*.