Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
cao tuc » cao duc, cao suc, cao toc
vai cua » dai cua, lai cua, bai cua
dao tuc » dao duc
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky

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

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