Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
nang mai » nang ma, nang tai, lang mai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
cac xuc » cam xuc, chat xuc, cac cuoc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi

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