Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai cuu » thai cua, tai cuc, thi cuc
dao thai » dao thi, do thai, da thai
cac tac » cac toc, cac bac, cac dac
sach ky » sach y, sach ty, sach kem
cac tuc » cac toc, cac tu, cac nuoc
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van ((cac tuc) or (cac tac)) va dao thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van ((cac tuc) OR (cac tac)) va dao thai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van ((cac tuc) or (cac tac)) va dao thai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van ((cac tuc) or (cac tac)) va dao thai cuu tre*.