Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
cua tre » cua te, cua triet, dua tren
xuc ban » duc ban, cuc ban, quoc ban
nam xuc » cam xuc, nam xua, nam thuc
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
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 ty) OR (sach y)) nang xa hoi. hieu van nam xuc ban thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang xa hoi. hieu van nam xuc ban thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang xa hoi. hieu van nam xuc ban thanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang xa hoi. hieu van nam xuc ban thanh vi ((cua tre) or (cuu tre))*.