Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
bai cua » ban cua, dai cua, lai cua
hai cua » thai cua, dai cua, hoi cua
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 cac ky nang x hoi. hieu va cac tac van hanh ((((bai cua) or (bai ca))) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang x hoi. hieu va cac tac van hanh ((((bai cua) OR (bai ca))) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang x hoi. hieu va cac tac van hanh ((((bai cua) or (bai ca))) or (hai cua)) tre*.