Perhaps you should try some spelling variations:
thuc hdoanh » thuc hanh
doanh khoa » toan khoa
sach tren » sach tien, sach tranh
thu doanh » thu oanh, tri doanh, thu hoach
phu thong » phap thong, khau thong, phan thong
pho thong » he thong
tren thu » tren thuc, tren thi, tien thu
khoa phu » khoa phau, khoa thu, hoa phu
khoa pho » khoa khoa, khoa phau, khoa hoc
vu sach » vu bach, su sach, vu khach
so sach » so sanh, bo sach, co sach
sach xa » sach dao, sach nha, sach bai
xa thuc » va thuc, xa phuc, a thuc

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

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