Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cam luc » cam xuc, cau luc
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty hang, ly nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) or (ty xang)) cao hoi. hieu va cam luc van ((hanh di) or (hang di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) cao hoi. hieu va cam luc van ((hanh di) OR (hang di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) cao hoi. hieu va cam luc van ((hanh di) or (hang di)) cua tre*.