Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
xac ky » cac ky, bac ky
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

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