Perhaps you should try some spelling variations:
nguoi doanh » nguoi dan, nguoi thanh, nguoi lanh
tren nguoi » ten nguoi, truyen nguoi, trien nguon
doanh khoa » toan khoa
dien nguoi » gian nguoi
sach tren » sach tien, sach tranh
phu thong » pho thong, phap thong, khau thong
sach dien » mach dien, sach tien, dich dien
nguoi anh » nguoi lanh, nuoi anh, nguoi thanh
hoc thong » hoc thuong, hoc trong, hoc hong
khoa phu » khoa phau, khoa thu, hoa phu
anh khoa » hang khoa
khoa hoc » hoa hoc
so sach » so sanh, bo sach, co sach
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tren nguoi doanh khoa phu thong ) or ( te sach dien nguoi anh khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tren nguoi doanh khoa phu thong ) OR ( te sach dien nguoi anh khoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tren nguoi doanh khoa phu thong ) or ( te sach dien nguoi anh khoa hoc thong ))*.