Perhaps you should try some spelling variations:
"co sac ky thuat cuong dung trong marketing" » "co sac ky thuat cuong dung tri marketing", "co sac ky thuat chuong dung trong marketing", "co sac ky thuat cong dung trong marketing", "co sac ky thuat tuong dung trong marketing", "co sac ky thuat tuong duong trong marketing", "co sac ky thuat thong dung trong marketing", "co sach ky thuat cuong dung trong marketing", "co cac ky thuat cuong dung trong marketing", "cao sach ky thuat cuong dung trong marketing", "co sai ky thuat cuong dung trong marketing"
"bo sach ty thuat ung dung tvqg marketing" » "bo sach ty thuat ung dung tri marketing", "bo sach ty thuat dung dung tvqg marketing", "bo sach ty thuat hung dung tvqg marketing", "bo sach ty thuat xung dung tvqg marketing", "bo sach ty thuat ung dung tong marketing", "bo sach my thuat ung dung tvqg marketing", "bo sach te thuat ung dung tvqg marketing", "bo sach thu thuat ung dung tvqg marketing", "co sach ty thuat ung dung tvqg marketing", "hoc sach ty thuat ung dung tvqg marketing", "bo sach y thuat ung dung tvqg marketing", "bo sach tu thuat ung dung tvqg marketing"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("co sac ky thuat cuong dung trong marketing") or ("bo sach ty thuat ung dung tvqg marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("co sac ky thuat cuong dung trong marketing") OR ("bo sach ty thuat ung dung tvqg marketing")).
• Removing quotes may allow a broader search: (( co sac ky thuat cuong dung trong marketing ) or ( bo sach ty thuat ung dung tvqg marketing )).
• Adding a wildcard symbol may retrieve word variants: (("co sac ky thuat cuong dung trong marketing") or ("bo sach ty thuat ung dung tvqg marketing"))*.