Perhaps you should try some spelling variations:
khoanh khac » khoa khac
cac khoanh » cac khoan, cac thanh, cac doanh
phap phong » hai phong, phap phan
khac thong » khac thuong, khac trong, khap thong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa phap » khoa phau, khoan phai, khong phap
sanh tai » sang tai, hanh tai, anh tai
tai thuc » thai thuc, dai thuc, thi thuc
sanh tri » thanh tri, dinh tri, minh tri
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc 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: (( so sanh tai thuc hang khoa phap phong ) or ( so sanh tri thuc cac khoanh khac thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tai thuc hang khoa phap phong ) OR ( so sanh tri thuc cac khoanh khac thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tai thuc hang khoa phap phong ) or ( so sanh tri thuc cac khoanh khac thong ))*.