Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
long soc » lon soc, luong suc, cong so
van nhan » van phan, van thanh, danh nhan
te mach » ke mach, te sach, tim mach
hai van » thai van, ha van, hai tan
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi
toan » tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: te mach hoc tap, nghien cuu long soc ((doanh khoa) or (toan khoa)) hoc xa hai van nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te mach hoc tap, nghien cuu long soc ((doanh khoa) OR (toan khoa)) hoc xa hai van nhan va.
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cuu long soc ((doanh khoa) or (toan khoa)) hoc xa hai van nhan va*.