Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
so sach » bo sach, co sach, hoc sach
hoi cua » hoi chuc
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (((so sanh) OR (do sanh)))) y lang xa hoi. lieu va cam thuc dan thanh hoi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (((so sanh) OR (do sanh)))) y lang xa hoi. lieu va cam thuc dan thanh hoi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (((so sanh) OR (do sanh)))) y lang xa hoi. lieu va cam thuc dan thanh hoi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (((so sanh) OR (do sanh)))) y lang xa hoi. lieu va cam thuc dan thanh hoi cua tu*.