Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
thanh va » thanh van, hanh va, thanh ha
van pham » san pham, van phan, van phat
duc ban » duc tan, duc van, dua ban
ky tang » ky dang, kho tang, ky trong
te sach » toc sach
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 pham duc ban thanh va ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky nang)) ha hoi. hieu van pham duc ban thanh va ((dua tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) or (ky nang)) ha hoi. hieu van pham duc ban thanh va ((dua tren) or (cau tren))*.