Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
duc manh » suc manh, duc anh, duc minh
loai cua » loai chat, loai va, dai cua
su sach » so sach, vu sach
loai ca » loai cay, loai va, loi ca
lai cua » dai cua, hai cua, lai chau
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 hanh ((loai ca) or (((loai cua) OR (lai cua)))) 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 hanh ((loai ca) OR (((loai cua) OR (lai cua)))) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu van cham duc manh hanh ((loai ca) or (((loai cua) OR (lai cua)))) viet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van cham duc manh hanh ((loai ca) or (((loai cua) OR (lai cua)))) viet*.