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