Perhaps you should try some spelling variations:
sach tham » sach nha
dan thuc » dan toc, am thuc
sach thu » sach thue, sach thieu, cach thuc
bai cua » ban cua, bai ca, hai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
dong xa » dong xay, duong xa, dong ha
va dan » ca dan, va dao, va dau

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