Perhaps you should try some spelling variations:
"phung thi luan van. noi dung quoc lo" » "phung thi luan van. noi dang quoc lo", "phung thi luan van. noi dong quoc lo", "phung thi luan van. noi trung quoc lo", "phung thi lan van. noi dung quoc lo", "phung thi xuan van. noi dung quoc lo", "phung thi loan van. noi dung quoc lo", "phung thi luan van. hoc dung quoc lo", "phung thi luan van. noi dung quoc co", "phung thi luan van. noi dung quoc o", "phung thi luan van. noi dung quoc hoi"
"phung thi luan van. noi dung quoc so" » "phung thi luan van. noi dang quoc so", "phung thi luan van. noi dong quoc so", "phung thi luan van. noi trung quoc so", "phung thi lan van. noi dung quoc so", "phung thi xuan van. noi dung quoc so", "phung thi loan van. noi dung quoc so", "phung thi luan van. hoc dung quoc so", "phung thi luan van. noi dung quoc son", "phung thi luan van. noi dung nuoc so", "phung thi luan van. noi dung quoc co"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("phung thi luan van. noi dung quoc lo") OR ("phung thi luan van. noi dung quoc so"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"phung thi luan van. noi dung quoc lo\") OR (\"phung thi luan van. noi dung quoc so\"))".
• Removing quotes may allow a broader search: (( phung thi luan van. noi dung quoc lo ) OR ( phung thi luan van. noi dung quoc so )).
• Adding a wildcard symbol may retrieve word variants: (("phung thi luan van. noi dung quoc lo") OR ("phung thi luan van. noi dung quoc so"))*.