Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hanh ve » hanh va, hanh kem
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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 ky lang xa hoi. hieu van cam ((duc ban) or (duc van)) ((hanh vi) or (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu van cam ((duc ban) OR (duc van)) ((hanh vi) OR (hanh ve)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu van cam ((duc ban) or (duc van)) ((hanh vi) or (hanh ve)) cua tre*.