Perhaps you should try some spelling variations:
nang cay » nang cao, nang cap, nang cai
cay phoi » cap phoi, tay hoi, cay cho
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet

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