Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
tai cua » thai cua, tai cuc, tri cua
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach tu, sach thu, xach tay
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
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 ty) OR (sach y)) ((tang ma) or (lang xa)) hoi. hieu va cam duc va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) ((tang ma) OR (lang xa)) hoi. hieu va cam duc va thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) ((tang ma) or (lang xa)) hoi. hieu va cam duc va thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) ((tang ma) or (lang xa)) hoi. hieu va cam duc va thanh tai cua tre*.