Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh lam » thanh lap, hanh kem, hanh va
pham huu » pham duc, pham duy, phan huy
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
lam va » nam va, dam va, lam ha

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

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