Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
va vanh » va van, va hanh, va danh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
va am » va lam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (te cac)) ky nang x hoi. hieu ((va am) OR (va cam)) thuc va vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (te cac)) ky nang x hoi. hieu ((va am) OR (va cam)) thuc va vanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (te cac)) ky nang x hoi. hieu ((va am) OR (va cam)) thuc va vanh dai cua tre*.