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 » lai cua, loai chat, loai va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
loai ca » loai cay, loai va, loi ca
y nang » ky nang, ly nang, v nang

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 xa hoi. hieu van cham duc manh hanh ((loai ca) or (loai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van cham duc manh hanh ((loai ca) OR (loai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cham duc manh hanh ((loai ca) or (loai cua)) viet*.