Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
thai cua » than cua, tai cuc, tri cua
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, tu cach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xay hoi » tay hoi, cay phoi, gay thoi
ly dang » ly hang, le dang, ly dong
te sach » toc sach
va cam » va cham, va cac, va cao

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) or (te sach)) ly dang ((xay hoi) OR (xa hoi)). hieu va cam duc va thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly dang ((xay hoi) OR (xa hoi)). hieu va cam duc va thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ly dang ((xay hoi) OR (xa hoi)). hieu va cam duc va thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ly dang ((xay hoi) OR (xa hoi)). hieu va cam duc va thanh thai cua tre*.