Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cuu ban » cuu van, cua ban, cuu san
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
xuc ban » duc ban, cuc ban, quoc ban
van cac » van hac, van cau, van bac
nang ho » nang hoc, nang co, tang ho
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ho hai » hoc hai, pho hai, cho hai

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 y nang ho hai. hieu van cac ((((xuc ban) or (cuu ban))) or (duc van)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ho hai. hieu van cac ((((xuc ban) OR (cuu ban))) OR (duc van)) hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ho hai. hieu van cac ((((xuc ban) or (cuu ban))) or (duc van)) hanh tai cua tre*.