Perhaps you should try some spelling variations:
phuong tien » phuong trinh
thuong minh » thong minh, truong minh, thuong binh
toan hang » toan thang, toan hanh, toan mang
toc sach » hoc sach, doc sach, thuoc sach
sach bai » sach dao, cac bai, sach xa
de giai » dan giai, kem giai
sach ca » sach cap, sach cua, sach xa
bai de » dai de, lai de, bai da
ca ke » cac ke, ca ve, ca me
doan » doanh, dan, soan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( toc sach bai de giai doan phuong tien ) or ( te sach ca ke toan hang thuong minh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach bai de giai doan phuong tien ) OR ( te sach ca ke toan hang thuong minh )).
• Adding a wildcard symbol may retrieve word variants: (( toc sach bai de giai doan phuong tien ) or ( te sach ca ke toan hang thuong minh ))*.