Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
bach ky » bac ky
day cua » dai cua
tay cua » ty cua
thuc va » thuc vat, thuc dan
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
va cao » va cac, va co, va dao
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky nang o hoi. hieu va cao ((thuc va) OR (thuc day)) thanh ((tay cua) or (day cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang o hoi. hieu va cao ((thuc va) OR (thuc day)) thanh ((tay cua) OR (day cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ky nang o hoi. hieu va cao ((thuc va) OR (thuc day)) thanh ((tay cua) or (day cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang o hoi. hieu va cao ((thuc va) OR (thuc day)) thanh ((tay cua) or (day cua)) tre*.