Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh phan » thanh pho, thanh san, thanh toan
luong duc » duong duc, luong cuoc, luong dich
van thanh » ban thanh, van tuan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
long soc » lon soc, luong suc, cong so
khoa hoc » hoa hoc
thi van » thi lan, thi hanh, thi nang
hoc xa » hoc ma
xa thi » xa thai, ha thi, ta thi

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

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