Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
thanh hoa » thanh pho
thu sach » tu sach, thuat sach, thuoc sach
sach hoi » sach doi, sach moi, cach thoi
cong hoa » dong hoa, dong hoc, hang hoa
cong coc » cong cuoc, cong cac, cong co
van phan » van phong, van thanh, luan phan
phan dan » phan dang, phan dau, nhan dan
hoi tai » hoc tai, hoi trac
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoi tai, nghien cua ((cong hoa) or (cong coc)) thanh hoa hoc xa hai van phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoi tai, nghien cua ((cong hoa) OR (cong coc)) thanh hoa hoc xa hai van phan dan.
• Adding a wildcard symbol may retrieve word variants: thu sach hoi tai, nghien cua ((cong hoa) or (cong coc)) thanh hoa hoc xa hai van phan dan*.