Perhaps you should try some spelling variations:
thanh dao » thanh dat, thanh dam, thanh do
tan thanh » tran thanh, tang thanh, toan thanh
va triet » va thiet, va trien, ve triet
sach thu » sach thue, sach thieu, sach tham
ve phan » va phan, ke phan, ve phat
ve pham » vi pham, v pham, ve phat
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
dao va » dao van, tao va, do 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 ty) or (sach thu)) nang xa hoi. hieu ((ve pham) OR (ve phan)) duc tan thanh dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu ((ve pham) OR (ve phan)) duc tan thanh dao va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) nang xa hoi. hieu ((ve pham) OR (ve phan)) duc tan thanh dao va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu ((ve pham) OR (ve phan)) duc tan thanh dao va triet*.