Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
can ky » van ky, dan ky, tan ky
ban ky » van ky, dan ky
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((can ky) OR (ban ky)) nang xa hoi. hieu va cao tuc va hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (ban ky)) nang xa hoi. hieu va cao tuc va hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((can ky) OR (ban ky)) nang xa hoi. hieu va cao tuc va hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) OR (ban ky)) nang xa hoi. hieu va cao tuc va hanh ((vai cua) or (hai cua)) tre*.