Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu cua » hieu qua, dieu cua, bieu cua
dang xay » dang van, van xay
lang xa » lang ha, lang van
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc dan, thuc day
su sach » vu sach
cua am » cua tam, cua nam, cua dam
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va

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) OR (so sach)) ty ((lang xa) or (dang xay)) hoi. hieu cua am thuc va dan va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty ((lang xa) OR (dang xay)) hoi. hieu cua am thuc va dan va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty ((lang xa) or (dang xay)) hoi. hieu cua am thuc va dan va su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty ((lang xa) or (dang xay)) hoi. hieu cua am thuc va dan va su triet*.