Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
nang hoa » nang hoat, hang hoa, nang hoc
hanh dai » hanh tai, hanh dao, vanh dai
thuc day » thuc vat
te sach » toc sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
hiem he » hiem xe, hieu he, thien he
thuc va » thuc vat
y nang » ky nang, ly nang, v nang
he nam » ha nam, nghe nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang hoa hoi. hiem he nam ((((thuc va) OR (thuc dan))) OR (thuc day)) hanh dai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang hoa hoi. hiem he nam ((((thuc va) OR (thuc dan))) or (thuc day)) hanh dai cua viet~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang hoa hoi. hiem he nam ((((thuc va) OR (thuc dan))) or (thuc day)) hanh dai cua viet*.