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

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 (su sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) du ban hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) du ban hang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) du ban hang hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) du ban hang hai cua tre*.