Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
khanh hoa » thanh hoa, hang hoa
cua cuong » cua cong, cua huong, cua truong
cuong cac » luong cac, cong cac, trong cac
cac khanh » cac thanh, cach nhanh, khac khanh
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
sach doi » sach hoi, sach moi, sach dao
hai van » thai van, ha van, hai tan
doi tap » doi tac, doi dap, doi tai
su sach » so sach, vu sach
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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 doi tap, nghien cua cuong cac khanh hoa hoc xa hai van ((nhan dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach doi tap, nghien cua cuong cac khanh hoa hoc xa hai van ((nhan dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: su sach doi tap, nghien cua cuong cac khanh hoa hoc xa hai van ((nhan dan) or (nhan tai))*.