Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
hoi nang » hoi lang, ho nang, hoa nang
hanh doi » thanh doi, hanh noi, hang doi
sach hoi » sach doi, sach moi, cach thoi
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi

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

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