Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
hang co » hang cho, hang ca, nang co
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y hang co hoi. hieu van cau duc va ((thanh ve) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang co hoi. hieu van cau duc va ((thanh ve) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y hang co hoi. hieu van cau duc va ((thanh ve) or (hanh vi)) cua tre*.