Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
nang hoc » nang doc, nang luc, dong hoc
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hoc hai » hoc dai, hoc bai, hoc tai
van cac » van hac, van cau, van bac
xuc ban » duc ban, cuc ban, xuat ban
cua tre » cua te, cuu tre, cua triet

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 hoc hai. hieu van cac ((((xuc ban) or (quoc ban))) or (duc va)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang hoc hai. hieu van cac ((((xuc ban) OR (quoc ban))) OR (duc va)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang hoc hai. hieu van cac ((((xuc ban) or (quoc ban))) or (duc va)) hanh thai cua tre*.