Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
ban thanh » ban hanh, ban hang
sach tham » sach nha
va triet » va thiet, va trien, ve triet
vu cham » va cham, vu kham, tu cham
duc ban » duc tan, duc van, dua ban
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, ve chim
x hoi » xa hoi, o hoi, x ho

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 ty) or (sach tham)) nang x hoi. hieu ((ve cham) OR (vu cham)) duc ban thanh dat va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tham)) nang x hoi. hieu ((ve cham) OR (vu cham)) duc ban thanh dat va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tham)) nang x hoi. hieu ((ve cham) OR (vu cham)) duc ban thanh dat va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tham)) nang x hoi. hieu ((ve cham) OR (vu cham)) duc ban thanh dat va triet*.