Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
du ban » dua ban, duc ban, du bao
x hoi » xa hoi, o hoi, 5 hoi

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 (vu sach)) ky nang ((x hoi) or (x ho)). hieu ve cac du ban hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang ((x hoi) OR (x ho)). hieu ve cac du ban hang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang ((x hoi) or (x ho)). hieu ve cac du ban hang hai cua tre*.