Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
sai ky » sac 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 ((sai ky) or (cac ky)) ((nang xa) OR (nang x)) hoi. hieu van cau duc ban thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sai ky) OR (cac ky)) ((nang xa) OR (nang x)) hoi. hieu van cau duc ban thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sai ky) or (cac ky)) ((nang xa) OR (nang x)) hoi. hieu van cau duc ban thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) or (cac ky)) ((nang xa) OR (nang x)) hoi. hieu van cau duc ban thanh thai cua tre*.