Perhaps you should try some spelling variations:
doanh khoa » toan khoa
soc doanh » so doanh, hoa doanh, voi doanh
nang quan » ban quan, nang suat
thu sach » tu sach, thuat sach, thuoc sach
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
quan van » luan van, quan va, quan luan
may thi » may thoi, day thi, mai thi
ma thi » mai thi, ha thi, ta thi

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoc tap, nghien cuu long soc doanh khoa hoc ((ma thi) OR (may thi)) nang quan van~".
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu long soc doanh khoa hoc ((ma thi) OR (may thi)) nang quan van*.