Perhaps you should try some spelling variations:
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. ((hieu ve) OR (hieu va)) cac 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 nang x hoi. ((hieu ve) OR (hieu va)) cac 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 nang x hoi. ((hieu ve) OR (hieu va)) cac tuc va hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky nang x hoi. ((hieu ve) OR (hieu va)) cac tuc va hanh ((vai cua) or (hai cua)) tre*.