Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
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
thai van » thi van, thai vung, thai den
cong so » cong san, cong hoa
xa thai » ca thai, a thai, da thai

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 cong so doanh ((khoa hoc) OR (hoa hoc)) xa thai van thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien thu cong so doanh ((khoa hoc) OR (hoa hoc)) xa thai van thanh van".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien thu cong so doanh ((khoa hoc) OR (hoa hoc)) xa thai van thanh van*.