Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
so triet » su triet, so thiet, bo triet
thi hanh » thi thanh
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, tu cach
hanh xa » hanh va, hanh ma, hanh xu
te sach » toc sach
hieu ve » hieu va, hieu van
hai so » dai so, tai so, thai son
ve am » va am

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) or (te sach)) thi hanh xa hoi. hieu ve am thuc ((van hanh) or (van thanh)) hai so triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) thi hanh xa hoi. hieu ve am thuc ((van hanh) OR (van thanh)) hai so triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) thi hanh xa hoi. hieu ve am thuc ((van hanh) or (van thanh)) hai so triet*.