Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
cua triet » cua viet, su triet, va triet
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
dinh vi » dinh ve, dinh viet, dinh tri
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
ve cau » ke cau, va cau, ve cac
luc va » duc va, loc va
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di cua

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

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