Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang ha » long ha
nang xa » nang x, lang xa, nang ma
van dau » van dao, phan dau
hai va » hai van, thai va, hoi va

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 ky ((nang xa) or (lang ha)) hoi. hieu van dau ((xuc ban) OR (duc ban)) thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang ha)) hoi. hieu van dau ((xuc ban) OR (duc ban)) thanh hai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang ha)) hoi. hieu van dau ((xuc ban) OR (duc ban)) thanh hai va triet*".