Perhaps you should try some spelling variations:
cac khanh » cac thanh, cach nhanh, khac khanh
khanh hoa » thanh hoa, hang hoa
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong cac » cuong cac, cong tac, cong cau
nhan tai » hang tai, van tai, toan tai
nhan va » nhan dan, nhan tao, phan van
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 khanh hoa hoc xa hoi va ((nhan va) OR (nhan tai))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoc tap, nghien cuu cong cac khanh hoa hoc xa hoi va ((nhan va) OR (nhan tai))".
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu cong cac khanh hoa hoc xa hoi va ((nhan va) OR (nhan tai))*.