Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thuc day » thuc dan, thuc vat
hang di » hang doi, hang vi, hang dien
thuc va » thuc vat, thuc dan
te sach » toc sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
di cau » da cau, diem cau
ve nam » he nam, va nam, le nam

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) or (so sanh)) ky lang xa hoi. hieu ve nam ((thuc va) OR (thuc day)) hang di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sanh)) ky lang xa hoi. hieu ve nam ((thuc va) OR (thuc day)) hang di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sanh)) ky lang xa hoi. hieu ve nam ((thuc va) OR (thuc day)) hang di cau tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky lang xa hoi. hieu ve nam ((thuc va) OR (thuc day)) hang di cau tren*.