Perhaps you should try some spelling variations:
dong hoa » dong hoc, dong co
hanh va » hanh vi
soc ban » hoc ban, coc ban, so ban
tu cham » toc cham, thi cham
hieu tu » chieu tu, hieu tuc, hien tu
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sac ky)) dong hoa hoc. hieu tu cham soc ban ((hanh va) OR (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) dong hoa hoc. hieu tu cham soc ban ((hanh va) OR (hang va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) or (sac ky)) dong hoa hoc. hieu tu cham soc ban ((hanh va) OR (hang va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sac ky)) dong hoa hoc. hieu tu cham soc ban ((hanh va) OR (hang va)) cua tre*.