Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
giai duc » giao duc, gia duc, giap duc
va thanh » gia thanh, ban thanh, va tinh
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sac ky)) nang x hoi. hieu va giai duc va thanh hai ((cuc tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) nang x hoi. hieu va giai duc va thanh hai ((cuc tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) or (sac ky)) nang x hoi. hieu va giai duc va thanh hai ((cuc tre) OR (cua tre))*".