Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
cham cuu » cap cuu, chat cua
tai cua » thai cua, tai cuc, tri cua
cuu ban » cuu van, cua ban, cuu san
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
lang ha » long ha
lang xa » 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 ((sach ty) or (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cham cuu ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cham cuu ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cham cuu ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cham cuu ban thanh tai cua tre*.