Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, nhanh ha, nganh hai
thanh hai » thanh phan, thanh hoa, thanh san
nang tai » hang tai, tang tai, sang tai
su sach » so sach
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tai hoi » tai khoi, dai hoi, tai hai
vu sach » vu bach, vu khach
luc va » duc va, tuc va, loc va
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ky nang tai hoi. hieu ve cac luc va ((nhanh hai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang tai hoi. hieu ve cac luc va ((nhanh hai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang tai hoi. hieu ve cac luc va ((nhanh hai) or (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang tai hoi. hieu ve cac luc va ((nhanh hai) or (thanh hai)) cua tre*.