Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hanh hai » thanh hai, nhanh hai, hang hai
hieu va » lieu va
sach ky » sac ky, sach y, sach ty
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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) OR (luc va)) hanh hai cau theo~.
• 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) OR (luc va)) hanh hai cau theo.
• 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) OR (luc va)) hanh hai cau theo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. ((hieu va) or (hieu qua)) chat ((xuc va) OR (luc va)) hanh hai cau theo*.