Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
hanh tai » thanh tai, hang tai, han tai
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
xuc ban » duc ban, cuc ban, xuat ban
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
ve cac » va cac, vien cac
ho hai » hoc hai, pho hai, cho hai

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