Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
dan quoc » dang quoc, han quoc, tran quoc
dau quoc » dau nuoc, da quoc, dang quoc
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
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: tu ((sach ky) or (sach y)) nang xa hoi. hieu van ((dau quoc) OR (dan quoc)) ban thanh hai va triet~.
• 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 quoc) OR (dan quoc)) ban thanh hai va triet*.
• 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 quoc) OR (dan quoc)) ban thanh hai va triet*".