Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cuu dong » cuu cong, cuu tong, cuu long
co khanh » co thanh, o khanh, co hanh
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
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 hoc) or (cach hoc)) tap, nghien cuu dong co khanh hoa hoc xa hai van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach hoc) OR (cach hoc)) tap, nghien cuu dong co khanh hoa hoc xa hai van nhan dan.
• Adding a wildcard symbol may retrieve word variants: thu ((sach hoc) or (cach hoc)) tap, nghien cuu dong co khanh hoa hoc xa hai van nhan dan*.