Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
phau thong » phap thong, khau thong, phan thong
sach khoa » sach nha, anh khoa, sinh khoa
khoa phau » hoa phan, khoa kham, khoa than
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
ki thuat » ky thuat
so sanh » do sanh
tu sach » thu sach, su sach, te 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 sanh ki thuat sach khoa phau thong ) or ( tu sach tham thuc bach khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh ki thuat sach khoa phau thong ) OR ( tu sach tham thuc bach khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh ki thuat sach khoa phau thong ) or ( tu sach tham thuc bach khoa phau thong ))*.