Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
pham cuc » pham chuc, pham duc, pham cua
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tinh vi » trinh vi, tinh voi, tinh va
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
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 lang) OR (ky tang)) van hoi. ((hieu ve) or (hieu va)) pham cuc ban tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) van hoi. ((hieu ve) OR (hieu va)) pham cuc ban tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky tang)) van hoi. ((hieu ve) or (hieu va)) pham cuc ban tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky tang)) van hoi. ((hieu ve) or (hieu va)) pham cuc ban tinh vi cua tre*.