Perhaps you should try some spelling variations:
khoan khap » khoanh khac, khoa kham, khoa khac
khap thong » phap thong, khau thong, khac thuong
sanh tri » thanh tri, dinh tri, minh tri
dac khoa » da khoa, dai khoa, dau khoa
so sanh » do sanh
tu sach » thu sach, su sach, te sach
tuc cac » tu cac, tich cac
tri tuc » tri thuc, tri tue, tri tac
khoa he » hoa he, khoa hoc, khong he
dao le » dao ve, hao le
do le » do ke

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 tri tuc cac khoan khap thong ) or ( tu sach ((dao le) OR (do le)) dac khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri tuc cac khoan khap thong ) OR ( tu sach ((dao le) OR (do le)) dac khoa he thong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sanh tri tuc cac khoan khap thong ) or ( tu sach ((dao le) OR (do le)) dac khoa he thong ))".
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri tuc cac khoan khap thong ) or ( tu sach ((dao le) OR (do le)) dac khoa he thong ))*.