Perhaps you should try some spelling variations:
"bo sach ky thuat ung dung tren marketing" » "bo sach ky thuat ung dung trong marketing", "bo sach ky thuat ung dung trinh marketing", "bo sach ky thuat ung dung thien marketing", "bo sach ky thuat dung dung tren marketing", "bo sach ky thuat hung dung tren marketing", "bo sach ky thuat song dung tren marketing", "bo sach ky thuat ung dung trung marketing", "co sach ky thuat ung dung tren marketing", "hoc sach ky thuat ung dung tren marketing", "bo sac ky thuat ung dung tren marketing", "bo sach y thuat ung dung tren marketing", "bo sach ty thuat ung dung tren marketing"
"hoc cac my thuat xung dung va marketing" » "hoc cac my thuat xung dung van marketing", "hoc cac my thuat xung dung tac marketing", "hoc cac my thuat xung dung gia marketing", "hoc cac my thuat dung dung va marketing", "hoc cac my thuat hung dung va marketing", "hoc cac my thuat song dung va marketing", "hoc cac my thuat cung dung va marketing", "hoc cac my thuat cuong dung va marketing", "hoc cac ki thuat xung dung va marketing", "hoc cac va thuat xung dung va marketing", "hoc cao my thuat xung dung va marketing", "hoc cac ky thuat xung dung va marketing"

Try widening your search to All Fields.

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

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