Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh doi » thanh doi, hanh noi, hang doi
nam thuc » nam thuoc, am thuc, nam thu
sach hoa » sach ha, sach hoi, bach hoa
hieu van » thien van, lieu va, hieu ve
hoa nang » hoa lang, ho nang, hoi nang
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoa nang ((mai hoi) or (lai hoi)). ((hieu van) or (hieu va)) nam thuc va hanh doi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoa nang ((mai hoi) OR (lai hoi)). ((hieu van) OR (hieu va)) nam thuc va hanh doi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach hoa nang ((mai hoi) or (lai hoi)). ((hieu van) or (hieu va)) nam thuc va hanh doi cua viet*.