Perhaps you should try some spelling variations:
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
thuoc bach » thuoc sach, thuoc ban, truc bach
bach khong » bach khang, bach phuong, bach khoa
sach tien » sach tren, sach thieu
tien thuc » trien thuc, kien thuc, bien thuc
ban thuoc » dang thuoc, cay thuoc, nam thuoc
thuc cac » thuc cach, tuc cac, phuc cac
sach ban » sach bai, sach han, sach bac
khong he » khong khi, hong ha, khong _
so sach » so sanh, bo sach, co sach
su sach » vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tien thuc cac khoan phai thong ) or ( su sach ban thuoc bach khong he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tien thuc cac khoan phai thong ) OR ( su sach ban thuoc bach khong he thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tien thuc cac khoan phai thong ) or ( su sach ban thuoc bach khong he thong ))*.