Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
xuc manh » suc manh, duc minh, bui manh
hanh vai » hanh vi, hanh va, hanh tai
duc manh » suc manh, duc anh, duc minh
hieu van » hieu va, thien van, lieu va
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
vai cua » dai cua, hai cua, lai cua
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: nuoc sach tu nang xa hoi. ((hieu ve) or (hieu van)) cam ((xuc manh) OR (duc manh)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cam ((xuc manh) OR (duc manh)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach tu nang xa hoi. ((hieu ve) or (hieu van)) cam ((xuc manh) OR (duc manh)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc sach tu nang xa hoi. ((hieu ve) or (hieu van)) cam ((xuc manh) OR (duc manh)) hanh vai cua tre*.