Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
vu cam » vu cham, vu cao, tu cam
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
ma hoi » mai hoi, ma hoa, me hoi
lo va » lo van, lao va, ly va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((ma hoi) OR (xa hoi)). hieu ((vu cam) or (va cam)) lo va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((ma hoi) OR (xa hoi)). hieu ((vu cam) OR (va cam)) lo va thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((ma hoi) OR (xa hoi)). hieu ((vu cam) or (va cam)) lo va thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ma hoi) OR (xa hoi)). hieu ((vu cam) or (va cam)) lo va thanh tai cua tre*.