Perhaps you should try some spelling variations:
te sach » toc sach
vai cua » hai cua, lai cua, bai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
co thuc » do thuc, co thua, mo thuc
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
nong va » nong van, dong va, cong va
nong xa » song xa, dong xa, cong xay
va co » vo co

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 tu ((nong xa) or (nong va)) hoi. hieu va co thuc va hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nong xa) OR (nong va)) hoi. hieu va co thuc va hanh ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nong xa) or (nong va)) hoi. hieu va co thuc va hanh ((vai cua) or (dai cua)) tre*.