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
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
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 va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoc tap, nghien cuu ((cong cac) OR (cong tac)) khanh hoa hoc xa hoi va nhan va".
• 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 va*.