Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hanh tai » hang tai, han tai, hinh tai
xuc ban » duc ban, cuc ban, quoc ban
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
sac ky » cac ky, sai ky

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