Perhaps you should try some spelling variations:
phan xuong » phan cong
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phan » hoa phan, khoa than, khoa phau
sach pham » sach phat, sach phap, san pham
huu phach » huu hanh
pham huu » pham duc, pham duy, phan huy
tu sach » thu sach, te sach, tu cach
su sach » so 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: (( tu sach tham thuc cach khoa phan xuong ) or ( su sach pham huu phach khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc cach khoa phan xuong ) OR ( su sach pham huu phach khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc cach khoa phan xuong ) or ( su sach pham huu phach khoan phai thong ))*.