Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau treo » cau theo, cau tren, cau triet
thanh di » thanh doi, thanh de, thanh do
thuc van » thuc vat, thuc dan, thuc va
dau thuc » dan thuc, dai thuc, dam thuc
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, xach tay
cuu tre » cua tre, cau tren
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) nang xa hoi. lieu va dau thuc van thanh di ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang xa hoi. lieu va dau thuc van thanh di ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach thu)) nang xa hoi. lieu va dau thuc van thanh di ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) nang xa hoi. lieu va dau thuc van thanh di ((cuu tre) OR (cau treo))*.