Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, anh thai
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
o hai » co hai, so hai, o lai

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 nang o hai. ((hieu ve) or (hieu van)) cac duc va ((hanh thai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hai. ((hieu ve) OR (hieu van)) cac duc va ((hanh thai) OR (hanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hai. ((hieu ve) or (hieu van)) cac duc va ((hanh thai) or (hanh tai)) cua tre*.