Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
tai cua » thai cua, tai cuc, tri cua
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach y)) lang xa hoi. hieu van ((cam duc) or (giao duc)) ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach y)) lang xa hoi. hieu van ((cam duc) OR (giao duc)) ban thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach y)) lang xa hoi. hieu van ((cam duc) or (giao duc)) ban thanh tai cua tre*.