Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh de » hanh ve, hanh kem
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ty lang xa hoi. hieu va cao tuc va ((hanh de) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty lang xa hoi. hieu va cao tuc va ((hanh de) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty lang xa hoi. hieu va cao tuc va ((hanh de) or (hanh vi)) cuu tre*.