Perhaps you should try some spelling variations:
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
mo thuc » mot thuc, do thuc, co thuc
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va mo » va mot, va moi, vi mo

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 ((nang xa) OR (nang ma)) hoi. hieu va mo thuc va hanh ((vai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang xa) OR (nang ma)) hoi. hieu va mo thuc va hanh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nang xa) OR (nang ma)) hoi. hieu va mo thuc va hanh ((vai cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang xa) OR (nang ma)) hoi. hieu va mo thuc va hanh ((vai cua) or (lai cua)) tre*.