Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
tu sach » thu sach, su sach, te sach
luc van » luoc van, luu van, duc van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
va cau » van cau, va dau, va cao
ma hoi » xa hoi, ma hoa, me hoi
cua cu » cua chu, cua cau, cua su

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 ((ma hoi) or (mai hoi)). hieu ((va cau) or (va cac)) luc van thanh dai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (mai hoi)). hieu ((va cau) OR (va cac)) luc van thanh dai cua cu.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (mai hoi)). hieu ((va cau) or (va cac)) luc van thanh dai cua cu*.