Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu tong, cuu long, luu dong
cuu cong » cua cong, thu cong, cac cong
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
va nhan » van nhan, ca nhan, va phan
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: su sach hoc tap, nghien ((cuu dong) or (cuu cong)) hoc khanh hoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien ((cuu dong) OR (cuu cong)) hoc khanh hoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien ((cuu dong) or (cuu cong)) hoc khanh hoa hoc xa hoi va nhan dan*.