Perhaps you should try some spelling variations:
cao tuc » dao tuc, cao duc, cao suc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
ca cua » co cua
ca cuu » cap cuu, cua cuu, ca cau
va dan » ca dan, va dao, va dau
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky
va cao » va cac, va co, va 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 ((sac ky) or (sai ky)) nang xa hoi. hieu va cao tuc va dan ((ca cuu) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) nang xa hoi. hieu va cao tuc va dan ((ca cuu) OR (ca cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) nang xa hoi. hieu va cao tuc va dan ((ca cuu) or (ca cua)) tre*.