Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cao luc » bao luc, cao duc, cao suc
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
sach v » sach va, sach y, sach 2
ma hoi » xa hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang
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: hoc sach v nang ((ma hoi) or (mai hoi)). lieu va cao luc ((va danh) OR (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach v nang ((ma hoi) OR (mai hoi)). lieu va cao luc ((va danh) OR (va hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach v nang ((ma hoi) or (mai hoi)). lieu va cao luc ((va danh) OR (va hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach v nang ((ma hoi) or (mai hoi)). lieu va cao luc ((va danh) OR (va hanh)) dai cua tre*.