Perhaps you should try some spelling variations:
"su sach bai thuc hanh khoa phan thuong" » "su sach bai thuc hanh khoa hang thuong", "su sach bai thuc hanh khoa phan xuong", "su sach bai thuc hang khoa phan thuong", "su sach bai thuc anh khoa phan thuong", "su sach bai thuc hanh hoa phan thuong", "su sach bai thuc hanh khoa than thuong", "su sach bai thuc hanh khoa phau thuong", "su sach dao thuc hanh khoa phan thuong", "su cac bai thuc hanh khoa phan thuong", "su sach xa thuc hanh khoa phan thuong", "su sach bai thuoc hanh khoa phan thuong", "su sach bao thuc hanh khoa phan thuong", "su sach dai thuc hanh khoa phan thuong", "so sach bai thuc hanh khoa phan thuong", "vu sach bai thuc hanh khoa phan thuong"
"tu sach tham chuc nang khoa pho thong" » "tu sach nha chuc nang khoa pho thong", "tu sach pham chuc nang khoa pho thong", "tu sach tham thuc nang khoa pho thong", "tu sach kham chua nang khoa pho thong", "tu sach tham chuc hang khoa pho thong", "tu sach tham chuc dang khoa pho thong", "tu sach tham chuc nang hoa pho thong", "tu sach tham chuc nang khoa he thong", "tu sach tham chuc nang khoa phu thong", "tu sach tham chuc nang khoa khoa thong", "tu sach tham chuc nang khoa phau thong", "thu sach tham chuc nang khoa pho thong", "te sach tham chuc nang khoa pho thong", "tu cach tham chuc nang khoa pho thong"

Try widening your search to All Fields.

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 bai thuc hanh khoa phan thuong") or ("tu sach tham chuc nang khoa pho thong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach bai thuc hanh khoa phan thuong") OR ("tu sach tham chuc nang khoa pho thong")).
• Removing quotes may allow a broader search: (( su sach bai thuc hanh khoa phan thuong ) or ( tu sach tham chuc nang khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (("su sach bai thuc hanh khoa phan thuong") or ("tu sach tham chuc nang khoa pho thong"))*.