Perhaps you should try some spelling variations:
ban banh » ban hanh, ban anh, ban danh
hieu van » hieu va, thien van, hieu ve
tu sach » thu sach, su sach, te sach
lam xuc » lam duoc
banh vi » hanh vi, ban vi, benh vi
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang o hoi. ((hieu van) or (lieu va)) ((lam xuc) OR (cam xuc)) ban banh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. ((hieu van) OR (lieu va)) ((lam xuc) OR (cam xuc)) ban banh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang o hoi. ((hieu van) or (lieu va)) ((lam xuc) OR (cam xuc)) ban banh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. ((hieu van) or (lieu va)) ((lam xuc) OR (cam xuc)) ban banh vi cua tre*.