Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
su sach » so sach, vu sach
cao hoi » cau hoi, cao hoc, tao hoi
danh vi » hanh vi, dinh vi, danh di
hieu ve » hieu van
va danh » va dinh, va dan, va hanh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
xuc va » duc va, tuc va, luc va
co hoi » co hoc, co loi
cua su » qua su

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 ty xang ((cao hoi) or (co hoi)). ((hieu ve) OR (hieu va)) chat xuc va danh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang ((cao hoi) OR (co hoi)). ((hieu ve) OR (hieu va)) chat xuc va danh vi cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang ((cao hoi) or (co hoi)). ((hieu ve) OR (hieu va)) chat xuc va danh vi cua su".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang ((cao hoi) or (co hoi)). ((hieu ve) OR (hieu va)) chat xuc va danh vi cua su*.