Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
doanh khoa » toan khoa
than thong » than thuong, toan thong, tran thong
trinh doc » trinh do, trinh hoa, trinh co
doc doanh » doi doanh, dong doanh, hoa doanh
phu thong » pho thong, phap thong, khau thong
sach tien » sach tren, sach thieu
khoi than » khoa than, khoi thuat, khai thac
khoa phu » khoa phau, khoa thu, hoa phu
tien hoc » tin hoc, tien hoa, dien hoc
cac khoi » cac thoi, cac khoan, cach thoi
te sach » toc sach
hoc cac » hoc cao

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

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