Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dao » lanh dao, thanh dat, thanh dam
pham duy » pham duc
phan duc » pham duc, phan tu, phan dau
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
tu cong » thu cong, te cong, tai cong
tu nong » tu dong, tu tong, tu tuong

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu nong) OR (tu cong)) xa hoi. hieu ve ((phan duc) or (pham duy)) va hanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nong) OR (tu cong)) xa hoi. hieu ve ((phan duc) OR (pham duy)) va hanh dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nong) OR (tu cong)) xa hoi. hieu ve ((phan duc) or (pham duy)) va hanh dao cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nong) OR (tu cong)) xa hoi. hieu ve ((phan duc) or (pham duy)) va hanh dao cua triet*.