Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cap phoi » cap cho
cay phoi » tay hoi, cay cho, gap phoi
tinh ve » trinh ve, tinh ven, dinh ve
duc may » duc mau, duc man, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
te sach » toc sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, gay thoi
ky danh » ky anh, ky dang
ve cac » va cac, vien cac
ve cua » le cua, de cua, te cua

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