Perhaps you should try some spelling variations:
ve triet » va trien
cham duc » pham duc, pham duy, phan duc
su triet » su viet, su tien
hanh te » hanh tu, hanh ve, hanh de
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach ty
te sach » toc sach
hieu va » lieu va, hieu qua
cong co » dong co, cong cu, cong so
tu cong » thu cong, te cong, tai cong
co hoi » co hoc, co loi

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 co hoi. hieu va ((cham duc) OR (cham soc)) va hanh te ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu cong co hoi. hieu va ((cham duc) OR (cham soc)) va hanh te ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu cong co hoi. hieu va ((cham duc) OR (cham soc)) va hanh te ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: te sach tu cong co hoi. hieu va ((cham duc) OR (cham soc)) va hanh te ((su triet) or (ve triet))*.