Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh hoi » hanh thoi, hanh noi, hanh hoa
thuc dan » thuc hanh, hoc dan, thuc vat
hoi cua » hoi chuc
thuc va » thuc vat, thuc day
hieu ve » hieu va, hieu van
hoa doi » hoa dai, hoc doi, xoa doi
hoc hoi » hoc khoi, hoc hoa, hoc noi
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san
ve am » va am

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