Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
hanh hai » thanh hai, nhanh hai, hang hai
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoc hoi
hai cua » thai cua, dai cua, hoi cua
hoa doi » hoa dai, hoc doi, xoa doi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam

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 ky lang ((hoa hoi) or (hoa doi)). hieu ve nam ((thuc va) OR (thuc dan)) hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ((hoa hoi) OR (hoa doi)). hieu ve nam ((thuc va) OR (thuc dan)) hanh hai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ((hoa hoi) or (hoa doi)). hieu ve nam ((thuc va) OR (thuc dan)) hanh hai cua viet".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ((hoa hoi) or (hoa doi)). hieu ve nam ((thuc va) OR (thuc dan)) hanh hai cua viet*.