Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh vai » danh va, doanh van, dang van
danh sai » dung sai, danh bat, danh dau
su sach » so sach, vu sach
hieu ve » hieu va
y nang » ky nang, ly nang, v nang
nam tu » nam thu, nam thuc
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 ve) or (hieu van)) nam tu va ((danh vai) OR (danh sai)) hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. ((hieu ve) OR (hieu van)) nam tu va ((danh vai) OR (danh sai)) hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. ((hieu ve) or (hieu van)) nam tu va ((danh vai) OR (danh sai)) hoa viet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu ve) or (hieu van)) nam tu va ((danh vai) OR (danh sai)) hoa viet*.