Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh hai » thanh hai, nhanh hai, hang hai
nam thuc » nam thuoc, am thuc, nam thu
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu he » hieu ve, hiem he, hieu le
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
he nam » ha nam, nghe nam
te san » te ban, ke san, tu san
te sac » te sach, te cac

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