Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
kien su » nien su, tien su, vien sau
va hanh » van hanh, va thanh, va danh
su viet » so viet
hieu ve » hieu va
sach da » sach dao, sach dat, sach dau
da nang » cam nang, kha nang, cao nang
ca thu » cac thu, cam thu, ca tru
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 da nang x hoi. ((hieu ve) OR (hieu van)) ((ca thu) or (nam thuc)) va hanh kien su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach da nang x hoi. ((hieu ve) OR (hieu van)) ((ca thu) OR (nam thuc)) va hanh kien su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach da nang x hoi. ((hieu ve) OR (hieu van)) ((ca thu) or (nam thuc)) va hanh kien su viet".
• Adding a wildcard symbol may retrieve word variants: su sach da nang x hoi. ((hieu ve) OR (hieu van)) ((ca thu) or (nam thuc)) va hanh kien su viet*.