Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
hieu van » hieu va, thien van, lieu va
hoai vai » hoai cai, thoai van, hoi va
duc manh » suc manh, duc anh, duc minh
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
hoai va » hoi va, loai va, hoa va
su sach » so sach
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) OR (vu sach)) ty nang x hoi. hieu van cham duc manh thanh ((hoai va) or (hoai vai)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty nang x hoi. hieu van cham duc manh thanh ((hoai va) OR (hoai vai)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty nang x hoi. hieu van cham duc manh thanh ((hoai va) or (hoai vai)) viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty nang x hoi. hieu van cham duc manh thanh ((hoai va) or (hoai vai)) viet*.