Perhaps you should try some spelling variations:
doc doanh » doi doanh, dong doanh, hoa 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 doc » nang luc
van nhan » van phan, van thanh, danh nhan
nhan tao » nhan tai, nhan dan
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoc tap, nghien cuu nang doc doanh hoa hoc ((xa hoi) or (chat thai)) van nhan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cuu nang doc doanh hoa hoc ((xa hoi) OR (chat thai)) van nhan tao.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu nang doc doanh hoa hoc ((xa hoi) or (chat thai)) van nhan tao*.