Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
va triet » va trien, ve triet, cua triet
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, quoc ban
van dau » van dao, phan dau
dau xuc » dau xac, dau xua, dau nuoc
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach y)) nang xa hoi. hieu van dau xuc ban thanh hai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. hieu van dau xuc ban thanh hai ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang xa hoi. hieu van dau xuc ban thanh hai ((va triet) or (va thiet))*".