Perhaps you should try some spelling variations:
duc xanh » duc anh, duc hanh, duc lanh
duc manh » suc manh, duc anh, duc minh
hanh lam » thanh lap, hanh kem, hanh va
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
ca viet » va viet, co viet, san viet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu van cham ((duc xanh) OR (duc manh)) hanh lam ((ca viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu van cham ((duc xanh) OR (duc manh)) hanh lam ((ca viet) OR (hoa viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu van cham ((duc xanh) OR (duc manh)) hanh lam ((ca viet) or (hoa viet))*".