Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh phan » thanh pho, thanh san, thanh toan
luong suc » luong duc, luong su, duong suc
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, cong so, lang son
khoa hoc » hoa hoc
thai van » thi van, thanh van, thai vung
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 cuu ((long soc) or (luong suc)) doanh khoa hoc da thai 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 suc)) doanh khoa hoc da thai van thanh phan.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu ((long soc) or (luong suc)) doanh khoa hoc da thai van thanh phan*.