Perhaps you should try some spelling variations:
phap phong » hai phong, phap phan
sach hoc » cach hoc, sach hoi, mach hoc
hoc phap » hoc phan, hoc phat, hoc pho
phong ho » phong cho, phong tho, phung ho
dan hanh » dang hanh, dan khanh, dan thanh
vu sach » vu bach, su sach, vu khach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cua » hoi chuc
dan han » dan chan, dan than, dan phan
ho xa » hoa xa, hoc xa, cho xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach hoc tap, nghien cuu mon hoc phap phong ho xa hoi cua ((dan han) OR (dan hanh))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach hoc tap, nghien cuu mon hoc phap phong ho xa hoi cua ((dan han) OR (dan hanh))".
• Adding a wildcard symbol may retrieve word variants: vu sach hoc tap, nghien cuu mon hoc phap phong ho xa hoi cua ((dan han) OR (dan hanh))*.