Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dao thai » dao thi, do thai, da thai
thai cuu » thai cua, tai cuc, thi cuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
cuu tre » cua tre, cau tren, cau treo
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 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 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 nang xa hoi. hieu van ((cac tuc) or (cac tac)) va dao thai cuu tre*.