Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
ban benh » san benh, ba benh, ban banh
mai khoi » mai khoa, tai khoa, cac khoi
hieu va » lieu va, hieu qua
benh vi » benh va, benh ve, benh li
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 benh 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 benh 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 benh vi cua tre*.