Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
ban hanh » ban hang
phan day » phan dau, phap day, phan xay
phan dai » phan dau, phan loai, phan dang
su triet » su viet, su tien, ve triet
tay lang » tai lang, tay tang, tay quang
hieu ve » hieu va, hieu van
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ((ty xang) or (tay lang)) xa hoi. hieu ve ((phan dai) OR (phan day)) ban hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ((ty xang) OR (tay lang)) xa hoi. hieu ve ((phan dai) OR (phan day)) ban hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ((ty xang) or (tay lang)) xa hoi. hieu ve ((phan dai) OR (phan day)) ban hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ((ty xang) or (tay lang)) xa hoi. hieu ve ((phan dai) OR (phan day)) ban hanh vi su triet*.