Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham duc » cham soc, pham duy, phan duc
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
cong co » dong co, cong cu, cong so
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
cong o » cong so, cong bo, cong ho
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 tu ((cong o) OR (cong co)) hoi. hieu va ((cham duc) or (pham duc)) va hanh ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((cong o) OR (cong co)) hoi. hieu va ((cham duc) OR (pham duc)) va hanh ve cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((cong o) OR (cong co)) hoi. hieu va ((cham duc) or (pham duc)) va hanh ve cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((cong o) OR (cong co)) hoi. hieu va ((cham duc) or (pham duc)) va hanh ve cua triet*.