Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
nang cho » nang chon, ngang cho, sang cho
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
xuc ban » duc ban, cuc ban, quoc ban
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va

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 cho) or (nang cao)) hoc. ((hieu ve) OR (hieu van)) cac xuc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang cho) OR (nang cao)) hoc. ((hieu ve) OR (hieu van)) cac xuc ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang cho) or (nang cao)) hoc. ((hieu ve) OR (hieu van)) cac xuc ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang cho) or (nang cao)) hoc. ((hieu ve) OR (hieu van)) cac xuc ban thanh tai cua tre*.