Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
toc sach » hoc sach, doc sach, thuoc sach
nang cay » nang cao, nang cap, nang cai
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
vai cua » dai cua, hai cua, lai cua
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
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: ((te sach) or (toc sach)) ky nang cay phoi. 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: ((te sach) OR (toc sach)) ky nang cay phoi. hieu van cac xuc ((van hanh) OR (ban hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang cay phoi. hieu van cac xuc ((van hanh) or (ban hanh)) vai cua tre*.