Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
cau theo » cau tao
hanh hai » thanh hai, nhanh hai, hang hai
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. ((hieu va) or (hieu qua)) chat xuc va hanh hai ((cau theo) OR (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. ((hieu va) OR (hieu qua)) chat xuc va hanh hai ((cau theo) OR (cau thi)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang o hoi. ((hieu va) or (hieu qua)) chat xuc va hanh hai ((cau theo) OR (cau thi))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. ((hieu va) or (hieu qua)) chat xuc va hanh hai ((cau theo) OR (cau thi))*.