Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
tai cuu » tai cuc, tai buu, tai cua
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: ((toc sach) OR (hoc sach)) ky nang xa hoi. hieu van cam thuc vat thanh tai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky nang xa hoi. hieu van cam thuc vat thanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky nang xa hoi. hieu van cam thuc vat thanh tai cuu tre*.