Perhaps you should try some spelling variations:
"te canh tranh hoc chuyen đe pho thong" » "te canh tranh khong chuyen đe pho thong", "te canh thanh hoc chuyen đe pho thong", "te canh tranh cuoc chuyen đe pho thong", "te canh tranh duoc chuyen đe pho thong", "ve canh tranh hoc chuyen đe pho thong", "te danh tranh hoc chuyen đe pho thong", "re canh tranh hoc chuyen đe pho thong"
"te sach tren hoc chuyen đe he thong" » "te sach tren khong chuyen đe he thong", "te sach tien hoc chuyen đe he thong", "te sach tranh hoc chuyen đe he thong", "te sach truyen hoc chuyen đe he thong", "te sach trung hoc chuyen đe he thong", "te sach triet hoc chuyen đe he thong", "toc sach tren hoc chuyen đe he thong"

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: (("te canh tranh hoc chuyen đe pho thong") or ("te sach tren hoc chuyen đe he thong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te canh tranh hoc chuyen đe pho thong") OR ("te sach tren hoc chuyen đe he thong")).
• Removing quotes may allow a broader search: (( te canh tranh hoc chuyen đe pho thong ) or ( te sach tren hoc chuyen đe he thong )).
• Adding a wildcard symbol may retrieve word variants: (("te canh tranh hoc chuyen đe pho thong") or ("te sach tren hoc chuyen đe he thong"))*.