Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ly hoang » ly hang, le hoang, ly hoan
dinh cau » dinh chau, dinh cuu, dinh cac
hieu van » hieu va, thien van, lieu va
cau loc » hau loc, cau hoc, cau luc
dinh cu » dinh cuu, dinh chuc, dinh chau
va hanh » van hanh, va thanh, va danh
van cau » van dau, van hau, van chat
ly hong » ly thong, le hong, ly hang
loc va » hoc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ly hoang) OR (ly hong)) xa hoi. hieu van cau loc va hanh ((dinh cau) or (dinh cu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly hoang) OR (ly hong)) xa hoi. hieu van cau loc va hanh ((dinh cau) OR (dinh cu)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ly hoang) OR (ly hong)) xa hoi. hieu van cau loc va hanh ((dinh cau) or (dinh cu)) treo".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly hoang) OR (ly hong)) xa hoi. hieu van cau loc va hanh ((dinh cau) or (dinh cu)) treo*.