Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
cao hoi » cau hoi, co hoi, cao hoc
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
luc va » duc va, tuc va
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (so sach)) ky nang cao hoi. lieu va cam ((luc va) OR (loc va)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang cao hoi. lieu va cam ((luc va) OR (loc va)) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky nang cao hoi. lieu va cam ((luc va) OR (loc va)) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang cao hoi. lieu va cam ((luc va) OR (loc va)) hanh hai cua tre*.