Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
thu vat » thuc vat, thu va, thuat vat
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
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: toc ((sach ky) or (sac ky)) lang xa hoi. hieu van nam thu vat thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sac ky)) lang xa hoi. hieu van nam thu vat thanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sac ky)) lang xa hoi. hieu van nam thu vat thanh tai cuu tre*.