Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
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 tu nang xa hoi. ((hieu ve) OR (hieu van)) cam duc va ((hanh lai) or (hanh lam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cam duc va ((hanh lai) OR (hanh lam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cam duc va ((hanh lai) or (hanh lam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cam duc va ((hanh lai) or (hanh lam)) cua tre*.