Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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 ty lang xa hoi. hieu v pham duc va hanh vi ((((cua tre) OR (cua triet))) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty lang xa hoi. hieu v pham duc va hanh vi ((((cua tre) OR (cua triet))) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty lang xa hoi. hieu v pham duc va hanh vi ((((cua tre) OR (cua triet))) or (cau tren))*".