Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hieu vien » hieu hien, hieu viec, thieu nien
thanh vai » thanh hai, thanh tai, thanh oai
vien dai » hien dai
sach ky » sac ky, sach y, sach kem
dai duc » dao duc, dai dua, mai duc
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) nang x ho. hieu vien dai duc tan ((thanh vai) or (thanh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang x ho. hieu vien dai duc tan ((thanh vai) OR (thanh van)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang x ho. hieu vien dai duc tan ((thanh vai) or (thanh van)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang x ho. hieu vien dai duc tan ((thanh vai) or (thanh van)) cuu tre*.