Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
cua triet » cua viet, su triet, va triet
mai hoi » mai khoi, dai hoi, lai hoi
dinh du » dinh duc, dinh cu, dinh tu
hieu ve » hieu va, hieu van
me hoi » le hoi
y sang » _ sang, duy sang
ve cau » ke cau, va cau, ve cac
luc va » tuc va, loc va
du cua » duy cua, dau cua, dum cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach y sang ((me hoi) or (mai hoi)). hieu ve cau ((luc va) OR (duc va)) dinh du cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach y sang ((me hoi) OR (mai hoi)). hieu ve cau ((luc va) OR (duc va)) dinh du cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach y sang ((me hoi) or (mai hoi)). hieu ve cau ((luc va) OR (duc va)) dinh du cua triet".
• Adding a wildcard symbol may retrieve word variants: nuoc sach y sang ((me hoi) or (mai hoi)). hieu ve cau ((luc va) OR (duc va)) dinh du cua triet*.