Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh
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: vu sach ((tin dung) or (van ban)) xa hoi. hieu ve pham duc van thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((tin dung) OR (van ban)) xa hoi. hieu ve pham duc van thanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ((tin dung) or (van ban)) xa hoi. hieu ve pham duc van thanh vi su triet*.