Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, vien da
cay phoi » cap phoi, tay hoi, cay cho
tinh ve » trinh ve, tinh ven, dinh ve
duc may » duc mau, duc man, duc manh
te sach » toc sach
xay hoi » xa hoi, tay hoi, gay thoi
y danh » ky danh, ly danh, 1 danh
ve cua » le cua, de cua, te cua
ve cac » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y danh ((xay hoi) or (cay phoi)). hieu ((ve cac) OR (vien cac)) duc may tinh ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y danh ((xay hoi) OR (cay phoi)). hieu ((ve cac) OR (vien cac)) duc may tinh ve cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y danh ((xay hoi) or (cay phoi)). hieu ((ve cac) OR (vien cac)) duc may tinh ve cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach y danh ((xay hoi) or (cay phoi)). hieu ((ve cac) OR (vien cac)) duc may tinh ve cua triet*.