Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
nang ho » nang hoc, nang co, tang ho
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
xuc ban » duc ban, cuc ban, quoc ban
duc van » duc va, duc tan, duc manh
tai cua » thai cua, tai cuc, tri cua
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) OR (van bac)) ((xuc 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) OR (van bac)) ((xuc ban) OR (duc van)) hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ho hai. hieu ((van cac) OR (van bac)) ((xuc 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) OR (van bac)) ((xuc ban) or (duc van)) hanh tai cua tre*.