Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
ban banh » ban hanh, ban anh, ban danh
mai khoi » mai khoa, tai khoa, cac khoi
hieu va » lieu va, hieu qua
banh vi » hanh vi, ban vi, benh vi
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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