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