Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
phau thong » phap thong, khau thong, phan thong
thuc cach » truoc cach, thuc hanh, tuc cac
phan tong » phan trong, phan cong, han tong
tai thuoc » tri thuoc, bai thuoc, tac thuoc
sach khoa » bach khoa, sach nha, anh khoa
khoa phau » hoa phan, khoa kham, khoa than
xay thuc » cay thuc, day thuc, xa thuc
cach hoc » cach thuc, cach thoi, dich hoc
hoc phan » hoc dan, hoc pho
sanh tai » sang tai, hanh tai, anh tai
so sanh » do sanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach xay thuc cach hoc phan tong ) or ( so sanh tai thuoc sach khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach xay thuc cach hoc phan tong ) OR ( so sanh tai thuoc sach khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach xay thuc cach hoc phan tong ) or ( so sanh tai thuoc sach khoa phau thong ))*.