Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh dai » thanh tai, thanh dat, thanh oai
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
mai hoi » dai hoi, lai hoi, mai doi
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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 ky nang ((mai hoi) OR (mai khoi)). hieu va cam xuc va ((thanh dai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu va cam xuc va ((thanh dai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai hoi) OR (mai khoi)). hieu va cam xuc va ((thanh dai) or (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu va cam xuc va ((thanh dai) or (thanh hai)) cua tre*.