Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
su sach » so sach, vu sach
ky tang » ky dang, kho tang, ky trong
duc van » duc va, duc tan, duc manh
cua tre » cua te, cua triet, dua tren
cuu 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: su sach ((ky tang) or (ky nang)) xa hoi. hieu van pham duc van thanh hai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (ky nang)) xa hoi. hieu van pham duc van thanh hai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (ky nang)) xa hoi. hieu van pham duc van thanh hai ((cua tre) or (cuu tre))*.