Perhaps you should try some spelling variations:
doanh khoa » toan khoa
luc doanh » muc doanh, luat doanh, luc canh
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien cuu dong luc doanh khoa hoc ((mai hoi) or (xa hoi)) va nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu dong luc doanh khoa hoc ((mai hoi) OR (xa hoi)) va nhan van.
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu dong luc doanh khoa hoc ((mai hoi) or (xa hoi)) va nhan van*.