Perhaps you should try some spelling variations:
van hoang » quan hoang, tran hoang, tuan hoang
van hoan » van hoa, van toan, van han
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hai cuu » hai cua, hai chu, hai cuc
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien 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 du ((van hoang) or (van hoan)) hai cuu 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 du ((van hoang) OR (van hoan)) hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu ve cac du ((van hoang) or (van hoan)) hai cuu tre*.