Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
sach hoi » sach doi, sach moi, cach thoi
cong coc » cong cuoc, cong cac, cong uoc
dap luan » dan luan, dap luat, dat luan
tu sach » thu sach, su sach, te sach
hoi tap » hoc tap, hoi tai, hai tap
mo hoan » moc hoang, hop hoan, ho khoan
cong co » dong co, cong cu, cong so

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoi tap, nghien cuu mo hoan thanh ((cong coc) or (cong co)) xa hoi dap luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien cuu mo hoan thanh ((cong coc) OR (cong co)) xa hoi dap luan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien cuu mo hoan thanh ((cong coc) or (cong co)) xa hoi dap luan van*.