Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
ky dang » ky danh
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
van anh » tuan anh, van minh
tai cua » thai cua, tai cuc, tri cua
ve cac » va cac, vien cac

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 ((ky dang) OR (ky nang)) xa hoi. hieu ve cac tuc ((van anh) or (van thanh)) tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky nang)) xa hoi. hieu ve cac tuc ((van anh) OR (van thanh)) tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) OR (ky nang)) xa hoi. hieu ve cac tuc ((van anh) or (van thanh)) tai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) OR (ky nang)) xa hoi. hieu ve cac tuc ((van anh) or (van thanh)) tai cua triet*.