Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua quoc » cua nuoc, cua thuoc
chat cuc » chat cua, chat xuc, chi cuc
thanh va » thanh van, hanh va, thanh ha
lai hoi » lai hoa, lai roi, tai hoi
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
cuc ban » cua ban, cac ban, cuu ban
mai hoi » mai khoi, mai doi, mai hoa
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((mai hoi) or (((lai hoi) or (dai hoi)))). hieu ve chat cuc ban thanh va cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((mai hoi) OR (((lai hoi) OR (dai hoi)))). hieu ve chat cuc ban thanh va cua quoc.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((mai hoi) or (((lai hoi) or (dai hoi)))). hieu ve chat cuc ban thanh va cua quoc*.