Perhaps you should try some spelling variations:
khoan toan » khoan thanh, khoa than, hoa toan
sach tien » sach tren, sach thieu
tien thuc » trien thuc, kien thuc, bien thuc
khoa phan » hoa phan, khoa than, khoa phau
phan cong » thanh cong
thuc cac » thuc cach, tuc cac, phuc cac
sach bai » sach dao, cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
thuc dac » thuoc dac, thuc dan, thuc day
dac khoa » da khoa, dai khoa, dau khoa
su sach » so sach, vu 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: (( su sach tien thuc cac khoan toan thong ) or ( te sach bai thuc dac khoa phan cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tien thuc cac khoan toan thong ) OR ( te sach bai thuc dac khoa phan cong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tien thuc cac khoan toan thong ) or ( te sach bai thuc dac khoa phan cong ))*.