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