Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
van pham » san pham, van phat, van tham
van phan » van phong, van thanh, luan phan
va triet » va thiet, va trien, ve triet
sach tu » cach tu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
duy may » duy mai, dung may, duy thay
tinh te » kinh te, tinh tu, tinh he
te va » tu 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 tu) OR (sach thu)) nang xa hoi. hieu ((van pham) OR (van phan)) duy may tinh te va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (sach thu)) nang xa hoi. hieu ((van pham) OR (van phan)) duy may tinh te va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (sach thu)) nang xa hoi. hieu ((van pham) OR (van phan)) duy may tinh te va triet*.