Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cong cac » cuong cac, cong cau, trong cac
cong tac » cong ty
nhan dan » phan dau, gian dan, nhan tai
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: thu sach hoc tap, nghien cuu ((cong cac) or (cong tac)) khanh hoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu ((cong cac) OR (cong tac)) khanh hoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu ((cong cac) or (cong tac)) khanh hoa hoc xa hoi va nhan dan*.