Perhaps you should try some spelling variations:
thanh dai » thanh tai, thanh dat, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
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) OR (su sach)) ky nang mai hoi. 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) OR (su sach)) ky nang mai hoi. 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) OR (su sach)) ky nang mai hoi. hieu va cam xuc va ((thanh dai) or (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang mai hoi. hieu va cam xuc va ((thanh dai) or (thanh hai)) cua tre*.