Perhaps you should try some spelling variations:
doanh khoa » toan khoa
soc doanh » so doanh, hoa doanh, voi doanh
tuan phan » luan phan, toan phan, tuan pham
sach hoc » cach hoc, sach hoi, mach hoc
cuu long » cuu cong, cuu tong, cuu nang
long soc » lon soc, luong suc, cong so
khoa hoc » hoa hoc
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
xa thai » a thai, da thai, xa hai
ca thai » chat thai, hoa thai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu long soc doanh khoa hoc ((xa thai) OR (ca thai)) van tuan phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu long soc doanh khoa hoc ((xa thai) OR (ca thai)) van tuan phan".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu long soc doanh khoa hoc ((xa thai) OR (ca thai)) van tuan phan*.