Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
doanh khoa » toan khoa
khan thong » khap thong, khau thong, nhan thong
khoa phau » hoa phan, khoa kham, khoa than
sach mai » bach mai, sach bai, sach mau
te doanh » te danh, de doanh, ty doanh
sach tri » sach tai, sach tren, sach bai
kho khan » khoa kham, khoa than
tu sach » thu sach, su sach, te sach
tue anh » tu anh, tuyet anh, tuan anh
anh kho » anh khoa, anh tho, anh cho
mai te » mai ten, mai tu, mai me

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach mai te doanh khoa phau thong ) or ( tu sach tri tue anh kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach mai te doanh khoa phau thong ) OR ( tu sach tri tue anh kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach mai te doanh khoa phau thong ) or ( tu sach tri tue anh kho khan thong ))*.