Perhaps you should try some spelling variations:
lanh dan » lanh dao, canh dan, lan dan
hieu va » hieu qua
thuc va » thuc vat, thuc dan, thuc day
va lanh » va lang, va danh, va hanh
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
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: ((te sac) or (te cac)) ky nang x hoi. ((hieu va) OR (lieu va)) am thuc va lanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang x hoi. ((hieu va) OR (lieu va)) am thuc va lanh dan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te cac)) ky nang x hoi. ((hieu va) OR (lieu va)) am thuc va lanh dan cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang x hoi. ((hieu va) OR (lieu va)) am thuc va lanh dan cua tre*.