Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
tuc va » thuc va, tuc xa, duc va
sac ky » cac ky
van ha » van hoa, van chat, van hanh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) nang xa hoi. hieu van ha ((tuc va) OR (truc va)) hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) OR (sai ky)) nang xa hoi. hieu van ha ((tuc va) or (truc va)) hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) OR (sai ky)) nang xa hoi. hieu van ha ((tuc va) or (truc va)) hanh tai cua tre*.