Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
phan thong » phan thuong, phan hong, phan tong
thuc phan » thuc pham, thu phan, thuc chan
tac thuoc » tao thuoc, truc thuoc, tac thuong
sach khoa » bach khoa, sach nha, anh khoa
pho thong » he thong
cac thuc » cach thuc, cac thu, can thuc
sanh tac » canh tac, sang tac, anh ta
khoa pho » khoa phu, khoa khoa, khoa phau
xay tuc » cay thuc, day thuc
tuc cac » tu cac, tich cac
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 tuc cac thuc phan thong ) or ( so sanh tac thuoc sach khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach xay tuc cac thuc phan thong ) OR ( so sanh tac thuoc sach khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach xay tuc cac thuc phan thong ) or ( so sanh tac thuoc sach khoa pho thong ))*.