Perhaps you should try some spelling variations:
phan hong » phan cong, pham hong, phan song
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
hoc phan » hoc dan, hoc pho
hong hoc » thong hoc, dong hoc, hong phuoc
nhan dan » phan dau, gian dan, nhan tai
van tai » von tai, van tuan
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 hong hoc xa hoi chuc ((nhan dan) or (van tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu mo hoc phan hong hoc xa hoi chuc ((nhan dan) OR (van tai)).
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu mo hoc phan hong hoc xa hoi chuc ((nhan dan) or (van tai))*.