Perhaps you should try some spelling variations:
"trong thi luan van. thoi xuyen tua lap" » "trong thi luan van. thi xuyen tua lap", "trong thi luan van. thoi nguyen tua lap", "trong thi luan van. thoi quen tua lap", "trong thoi luan van. thoi xuyen tua lap", "trong thu luan van. thoi xuyen tua lap", "trong tho luan van. thoi xuyen tua lap", "trong thi luan van. thoi huyen tua lap", "trong thi luan van. thoi xuyen tu lap", "trong thi luan van. thoi xuyen quan lap", "trong thi lan van. thoi xuyen tua lap", "trong thi xuan van. thoi xuyen tua lap", "trong thi loan van. thoi xuyen tua lap", "trong thi luan van. thoi xuyen tuc lap", "trong thi luan van. thoi xuyen thuat lap", "trong thi luan van. thoi xuyen toan lap"
"phuong thi qua ban. hoi huyen tu lap" » "phung thi qua ban. hoi huyen tu lap", "huong thi qua ban. hoi huyen tu lap", "phong thi qua ban. hoi huyen tu lap", "phuong thi qua ban. hoi truyen tu lap", "phuong thi qua ban. hong huyen tu lap", "phuong thi qua ban. thi huyen tu lap", "phuong thi qua ban. hoi chuyen tu lap", "phuong thi qua ban. hoi huyen tua lap", "phuong thi qua ban. hoi huyen vu lap", "phuong thi quan ban. hoi huyen tu lap", "phuong thi dua ban. hoi huyen tu lap", "phuong thi cua ban. hoi huyen tu lap", "phuong thi qua quan. hoi huyen tu lap", "phuong thi qua ban. hoi huyen truc lap"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("phuong thi qua ban. hoi huyen tu lap") or ("trong thi luan van. thoi xuyen tua lap"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("phuong thi qua ban. hoi huyen tu lap") OR ("trong thi luan van. thoi xuyen tua lap")).
• Removing quotes may allow a broader search: (( phuong thi qua ban. hoi huyen tu lap ) or ( trong thi luan van. thoi xuyen tua lap )).
• Adding a wildcard symbol may retrieve word variants: (("phuong thi qua ban. hoi huyen tu lap") or ("trong thi luan van. thoi xuyen tua lap"))*.