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

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