Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va
hoa hoi » khoa hoi, hoa hoc, hoc hoi
hoa doi » hoa dai, hoc doi, xoa doi
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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