Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ly » sach ty, sach hay, sach luu
sach lo » sach dao, sach doi, sach hoi
da duoc » tao duoc, hoa duoc
duoc ma » duoc lam
ma hanh » va hanh, da hanh, na hanh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
vang x » nang x
van da » van dao, van dau, van dan
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((((sach ly) or (sach lo))) or (sach y)) vang x hoi. hieu van da duoc ma hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach ly) OR (sach lo))) OR (sach y)) vang x hoi. hieu van da duoc ma hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((((sach ly) or (sach lo))) or (sach y)) vang x hoi. hieu van da duoc ma hanh va cua tre*.