Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
du triet » su triet, tu triet, cua triet
te sach » toc sach
tu cong » te cong, tai cong, thi cong
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
hanh te » hanh tu, hanh ve, hanh de
o hoi » co hoi, o hoc, o hai

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) OR (thu cong)) o hoi. hieu va cham duc va hanh te du triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu cong) OR (thu cong)) o hoi. hieu va cham duc va hanh te du triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu cong) OR (thu cong)) o hoi. hieu va cham duc va hanh te du triet*.