Perhaps you should try some spelling variations:
dong hoa » dong hoc, dong co
hieu tu » chieu tu, hieu tuc, hien tu
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
xuc van » luc van, vuc van, xuc ban
so sach » bo sach, co sach, hoc sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dong » ly dong, ky dang, ky cong
so sanh » do sanh
chu tre » cho tre, chu tri, cuu tre
tu cam » tu cham, tu cac, tu nam
va chu » va che, va cau, va chi

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) or (so sanh)) ky dong hoa hoi. hieu tu cam ((xuc van) or (duc van)) hanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky dong hoa hoi. hieu tu cam ((xuc van) OR (duc van)) hanh va chu tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ky dong hoa hoi. hieu tu cam ((xuc van) or (duc van)) hanh va chu tre*.