Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
phan dau » phan tu, hang dau
sach dao » lanh dao
van phan » van phong, van thanh, luan phan
hoc tan » hoc tang, hoc dan, hoc tap
dan hoc » van hoc, dan toc, dai hoc
cua dan » cua dang, cua ban, ca dan
hai van » thai van, ha van, hai tan
dao tap » dao tao, dao tay, dao gap
su sach » so sach, vu sach
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: su sach dao tap, nghien cua dan hoc tan ((khoa hoc) or (hoa hoc)) xa hai van phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dao tap, nghien cua dan hoc tan ((khoa hoc) OR (hoa hoc)) xa hai van phan dau.
• Adding a wildcard symbol may retrieve word variants: su sach dao tap, nghien cua dan hoc tan ((khoa hoc) or (hoa hoc)) xa hai van phan dau*.