Perhaps you should try some spelling variations:
soc doanh » so doanh, hoa doanh, voi doanh
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
cuu nang » chuc nang, cam nang, cuu van
nang soc » nang doc, nang hoc, nang som
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
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 nang soc doanh hoa hoc ((xa hoi) or (ca thai)) van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu nang soc doanh hoa hoc ((xa hoi) OR (ca thai)) van nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu nang soc doanh hoa hoc ((xa hoi) or (ca thai)) van nhan dan*.