Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
vanh dai » van dai, vanh tai, lanh dao
dai cuu » dai cua, dai huu
va vanh » va van, va danh, va hanh
cam tuc » cam xuc, nam thuc, dam thuc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
cam tu » cam thu, nam tu, dam tu

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 ty nang xa hoi. ((hieu ve) or (hieu van)) ((cam tuc) or (cam tu)) va vanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. ((hieu ve) OR (hieu van)) ((cam tuc) OR (cam tu)) va vanh dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. ((hieu ve) or (hieu van)) ((cam tuc) or (cam tu)) va vanh dai cuu tre*.