Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
vu sach » vu bach, vu khach
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
su sach » so sach
ma hoi » mai hoi, xa hoi, me hoi
ve cau » ke cau, va cau, ve cac
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: ((vu sach) or (su sach)) ly nang ((ma hoi) OR (ma hoa)). hieu ve cau luc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ly nang ((ma hoi) OR (ma hoa)). hieu ve cau luc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ly nang ((ma hoi) OR (ma hoa)). hieu ve cau luc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ly nang ((ma hoi) OR (ma hoa)). hieu ve cau luc va hanh dai cua tre*.