Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghe thu
doanh khoa » toan khoa
van thanh » ban thanh, van tuan
thanh van » thanh san, thanh toan, thanh phan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
so doanh » so danh, su doanh, hoa doanh
khoa hoc » hoa hoc
thai van » thi van, thai vung, thai den
cong so » cong san, cong hoa
da thai » dao thai, do thai, ca thai
hoc da » hoc dan, hoc dai, hoc dat

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 thu) or (nghien cuu)) cong so doanh khoa hoc da thai van thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, ((nghien thu) OR (nghien cuu)) cong so doanh khoa hoc da thai van thanh van.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, ((nghien thu) or (nghien cuu)) cong so doanh khoa hoc da thai van thanh van*.