Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
khoa phau » hoa phan, khoa kham, khoa than
thuc cach » thuoc sach, truoc cach, thuc hanh
hoc thong » hoc thuong, hoc trong, hoc hong
dac khoa » da khoa, dai khoa, dau khoa
sach dai » sach dao, sach bai, sach dat
dai thuc » dan thuc, dai thu, dai thua
cach hoa » cach hoan, cach hoc, bach hoa
te sach » toc sach
mai ve » moi ve, dai ve, mai me
bach » bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu bach ((mai ve) or (mai va)) dac khoa phau thong ) or ( te sach dai thuc cach hoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu bach ((mai ve) OR (mai va)) dac khoa phau thong ) OR ( te sach dai thuc cach hoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( vu bach ((mai ve) or (mai va)) dac khoa phau thong ) or ( te sach dai thuc cach hoa hoc thong ))*.