Perhaps you should try some spelling variations:
sach tham » sach nha
thanh dat » thanh san, thanh hai, thanh van
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh

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