Perhaps you should try some spelling variations:
hanh loai » thanh hoai, thanh loan, phan loai
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
duc manh » suc manh, duc anh, duc tan
duc minh » duc anh
su sach » so sach, vu sach
ca viet » va viet, hoa viet, san viet
co viet » so viet, o viet, hoc viet
y nang » ky nang, ly nang, v nang
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: su sach y nang x hoi. hieu van cham ((duc manh) or (duc minh)) hanh loai ((ca viet) or (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu van cham ((duc manh) OR (duc minh)) hanh loai ((ca viet) OR (co viet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van cham ((duc manh) or (duc minh)) hanh loai ((ca viet) or (co viet))*.