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
tue cac » tu cac, tuc cac, te cac
te sach » toc sach
khoa he » hoa he, khoa hoc, khong he
bai le » tai le, bac le, hai le
ban le » ban ve

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 tue cac khoan khap thong ) OR ( te sach ((bai le) OR (ban le)) dac khoa he thong ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sanh tri tue cac khoan khap thong ) OR ( te sach ((bai le) OR (ban le)) dac khoa he thong ))".
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri tue cac khoan khap thong ) OR ( te sach ((bai le) OR (ban le)) dac khoa he thong ))*.