Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
va triet » va thiet, va trien, ve triet
sach thu » sach thue, sach thieu, sach tham
tan hanh » tan thanh, toan hanh, tran hanh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
v pham » vi pham, d pham
dao va » dao van, tao va, do va
hieu v » hieu va, hieu ve, hieu 2

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 v pham duc ((tan hanh) OR (tang hanh)) 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 v pham duc ((tan hanh) OR (tang hanh)) 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 v pham duc ((tan hanh) OR (tang hanh)) dao va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu v pham duc ((tan hanh) OR (tang hanh)) dao va triet*.