Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai cuu » thai cua, tai cuc, thi cuc
dan thai » dang thai, dan thi, dan than
cuu tre » cua tre, cau tren, cau treo
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau
tu sac » tu sach, tu cac, tu san

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