Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang cay » nang cao, nang cap, nang cai
cay phoi » cap phoi, tay hoi, cay cho
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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 ve 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 ve cac xuc ((van hanh) OR (ban hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang cay phoi. hieu ve 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 ve cac xuc ((van hanh) or (ban hanh)) vai cua tre*.