Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh oai
thanh dat » thanh san, thanh hai, thanh van
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chao » van chat, van hao, van cho
sach ky » sac ky, sach ty, sach kem
chao tu » chao xu, cho tu, cao tu

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 x ho. hieu van chao tu va ((thanh dai) OR (thanh dat)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang x ho. hieu van chao tu va ((thanh dai) OR (thanh dat)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x ho. hieu van chao tu va ((thanh dai) OR (thanh dat)) cua triet*".