Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
voi nang » voi hang, hoi nang, voi rang
danh dai » danh dau, danh di, danh sai
va danh » va dinh, va dan, va hanh
cao luc » bao luc, cao duc, cao suc
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
vu nang » vuc nang, va nang, vu dang
ma hoi » xa hoi, ma hoa, me hoi
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((voi nang) or (vu nang)) ((ma hoi) or (mai hoi)). lieu va cao luc va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((voi nang) OR (vu nang)) ((ma hoi) OR (mai hoi)). lieu va cao luc va danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((voi nang) or (vu nang)) ((ma hoi) or (mai hoi)). lieu va cao luc va danh dai cua tre*.