Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa phau » hoa phan, khoa kham, khoa than
khach tri » khach trai, khac trai, khanh tra
bach khoa » anh khoa
sanh tai » sang tai, hanh tai, anh tai
tai thuc » thai thuc, tri thuc, dai thuc
thi bach » thi bich, thi hanh, thi anh
so sanh » do sanh
tri thi » tri tai, tai thi, thi thi
khoa he » hoa he, khoa hoc, khong he

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 tai thuc hanh khoa phau thong ) or ( vay khach tri thi bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tai thuc hanh khoa phau thong ) OR ( vay khach tri thi bach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tai thuc hanh khoa phau thong ) or ( vay khach tri thi bach khoa he thong ))*.