Perhaps you should try some spelling variations:
dang manh » dang hanh, duong manh, dang thanh
dang minh » dang dinh, dang sinh, dang tinh
nam thuc » nam thuoc, nam thu, nam tu
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
va ca » va cac, va cao, va cai

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 ((nam thuc) or (am thuc)) ((dang manh) OR (dang minh)) va ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ve ((nam thuc) OR (am thuc)) ((dang manh) OR (dang minh)) va ca viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ve ((nam thuc) or (am thuc)) ((dang manh) OR (dang minh)) va ca viet*".