Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va
hai cua » thai cua, dai cua, hoi cua
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
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) OR (hieu van)) cam thuc van hanh ((hai cua) or (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky nang x hoi. ((hieu ve) OR (hieu van)) cam thuc van hanh ((hai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ky nang x hoi. ((hieu ve) OR (hieu van)) cam thuc van hanh ((hai cua) or (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: tu dan ky nang x hoi. ((hieu ve) OR (hieu van)) cam thuc van hanh ((hai cua) or (lai chau)) tre*.