Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
tai lang » tai cong, thi lan, va lang
hieu van » thien van, lieu va, hieu ve
phan dai » phan dau, phan day, phan loai
ban hanh » ban hang
su triet » su viet, su tien, ve triet
tai san » tai ngan
hieu va » lieu va, hieu qua
dai ban » dai han, tai ban, di ban
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 ((tai lang) OR (tai san)) xa hoi. ((hieu van) or (hieu va)) phan dai ban hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ((tai lang) OR (tai san)) xa hoi. ((hieu van) OR (hieu va)) phan dai ban hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ((tai lang) OR (tai san)) xa hoi. ((hieu van) or (hieu va)) phan dai ban hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ((tai lang) OR (tai san)) xa hoi. ((hieu van) or (hieu va)) phan dai ban hanh vi su triet*.