Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
hang vi » hang va, hanh vi, hang di
cu tren » tu tren, dua tren
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
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 dan hang vi ((cau tren) OR (cu 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 dan hang vi ((cau tren) OR (cu 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 dan hang vi ((cau tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky lang xa hoi. hieu ve nam thuc dan hang vi ((cau tren) OR (cu tren))*.