Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cao, va cai
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: tu sach y nang ma hoi. hieu ((va cam) OR (va cac)) lo va thanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu ((va cam) OR (va cac)) lo va thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu ((va cam) OR (va cac)) lo va thanh tai cua tre*.