Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thu bang » thu ban, thu hang, thu trang
chu bang » chuc nang, chu quang, chu trang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
nam duc » nam duoc, pham duc, nam thuc
cuu tre » cua tre, cau tren, cau treo

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 ((thu bang) OR (chu bang)) mai hoi. hieu van nam duc va thanh hai ((cuu tre) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu bang) OR (chu bang)) mai hoi. hieu van nam duc va thanh hai ((cuu tre) OR (cua vat))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu bang) OR (chu bang)) mai hoi. hieu van nam duc va thanh hai ((cuu tre) or (cua vat))*".