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