Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tham dua » tham du, pham duc, pham duy
van tham » van thanh, van tuan, van chat
dua tren » dung tren
thanh va » thanh van, hanh va, thanh ha
hieu van » hieu va, thien van, lieu va
dua ban » dia ban, cua ban, qua ban
te sach » toc sach
ky tang » ky dang, kho tang, ky trong
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky tang) or (ky nang)) ha hoi. hieu van tham dua ban thanh va ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky nang)) ha hoi. hieu van tham dua ban thanh va ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) or (ky nang)) ha hoi. hieu van tham dua ban thanh va ((dua tren) or (cuu tre))*.