Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
thi hang » thi hanh, thi nang, thi thanh
thi hong » thi cong, thi phuong, thi hanh
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
su sach » so sach, vu sach
xuc ban » duc ban, cuc ban, quoc ban
nam xuc » cam xuc, nam xua, nam thuc

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 ((thi hang) OR (thi hong)) xa hoi. hieu van nam xuc ban thanh van ((cuu tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thi hang) OR (thi hong)) xa hoi. hieu van nam xuc ban thanh van ((cuu tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thi hang) OR (thi hong)) xa hoi. hieu van nam xuc ban thanh van ((cuu tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((thi hang) OR (thi hong)) xa hoi. hieu van nam xuc ban thanh van ((cuu tre) or (su triet))*.