Perhaps you should try some spelling variations:
"su sach truc thuc hanh khoa phau thong" » "su sach truc thuc hanh khoa phap thong", "su sach truc thuc hanh khoa khau thong", "su sach truc thuc hanh khoa phan thong", "su cach thuc thuc hanh khoa phau thong", "su sach tren thuc hanh khoa phau thong", "su sach thu thuc hanh khoa phau thong", "su sach truc thuoc hanh khoa phau thong", "su sach thuc thuc hanh khoa phau thong", "su sach truc thuy hanh khoa phau thong", "su sach truc thuc hang khoa phau thong", "su sach truc thuc anh khoa phau thong", "su sach truc thuc hanh hoa phau thong", "su sach truc thuc hanh hoa phan thong", "su sach truc thuc hanh khoa kham thong", "su sach truc thuc hanh khoa than thong", "vu sach truc thuc hanh khoa phau thong"
"so sach dao tuc cac hoc he thong" » "so lanh dao tuc cac hoc he thong", "so sanh dao tuc cac hoc he thong", "bo sach dao tuc cac hoc he thong", "co sach dao tuc cac hoc he thong", "so sach dao duc cac hoc he thong", "so sach dao tu cac hoc he thong", "so sach dao tich cac hoc he thong", "so sach dao tuc cach hoc he thong", "so sach dao tuc cac hop he thong", "so sach dao tuc bac hoc he thong", "so sach dao tuc cac hoc hien 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 truc thuc hanh khoa phau thong") or ("so sach dao tuc cac hoc he thong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach truc thuc hanh khoa phau thong") OR ("so sach dao tuc cac hoc he thong")).
• Removing quotes may allow a broader search: (( su sach truc thuc hanh khoa phau thong ) or ( so sach dao tuc cac hoc he thong )).
• Adding a wildcard symbol may retrieve word variants: (("su sach truc thuc hanh khoa phau thong") or ("so sach dao tuc cac hoc he thong"))*.