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 co, cong uoc
cong cac » cuong cac, cong tac, cong cau
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
mo hoan » moc hoang, hop hoan, ho khoan
hoi van » hoi va, hoi dan, hai van

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

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